Ideas about my neurology, also left leg twitch like in REM sleep...?

Sorry, this is a bit long but I have never really said any of this to anyone before so I just wanna see how viable it sounds.

So I am extremely introspective and highly self aware both psychologically and physically. I am usually overly sensitive to any sensation in my body as well as what is going on inside my head, thoughts, and neurology (so I think). I have been very very focused on the idea of identifying the differences between my left and right brain hemispheres. For years now I have had bad anxiety, depression, and insomnia (eventually leading to a self-diagnosis [albeit an accurate one] of derealization and depersonalization). I am very neurotic when it comes to my anxiety, I am always planning and trying to see every possible outcome ahead of me, which makes me think that my Left Hemisphere (logic) is constantly in overdrive. Simultaneously, since I have derealization and I only feel a very slight emotional connection with ANYTHING if I form emotional bonds at all, makes me think that my Right Hemisphere is probably relatively inactive.

I am right handed, I "think" my right ear hears better, and my right eye has better vision... leading me to the assumption that my Left Hemisphere is overall more active. This then makes me wonder if somehow all of my stress from anxiety, depression, and mental fatigue is much more concentrated in my Right Hemisphere.

In addition to worse physical function, hearing, and eyesight, my left testicle is also noticeably closer to my body at all times to the point that it may go up inside me at not 'that' cold of a temperature. It may be a hernia, I am unsure and have not seen a doctor about it, but I also wonder if it doesn't have something more to do with my Right Hemisphere. Typically after sex, my left testicle will descend and go even lower than my right rather than always staying closer to my body. I also notice that my right testicle tends to be more swollen even after ejaculation, and never seems to get too close to my body as it is supposed to to squeeze out the sperm before ejaculation. Now, what this all leads me to is that I think I ALSO have low dopamine (which would make sense after years of stress, depression, and insomnia). Low dopamine may also explain why for a long time I have masturbated fairly frequently and at times impulsively (i.e. to get a quick rush of dopamine to the brain). What if my Right Hemisphere is perpetually keeping my left testicle closer to my body, where it is continuously being squeezed empty for any ejaculate fluid... almost like my Right Hemisphere is constantly trying to have an orgasm and get that dopamine and stress release?

Is there any existing proven or theoretical thought on brain function like this? Does it sound plausible?

PS to build on the Right Hemisphere stress idea, the left half of my body is ALWAYS more rigid and stiff with everything I do, almost like the left half is trying to perform but can't as if it is under immense pressure to be perfect, and so it falters because of this added rigidity. This also brings me to...

My other concern is that I have a strange twitch in my left leg particularly, but that can stretch through pretty much my whole body. It is not an absent twitch, in fact I actually consciously control when it may happen in a way. It is like one day a while ago, I realized how tense the left half of my body is, and somehow just by focusing hard enough on one muscle group in my body (it seems that the most tense part of my body is the left inner thigh and lower abs, actually where the testicular retraction muscles lie [which may again sign to a hernia but just for arguments sake...]) I can almost relax the tense muscles. EXCEPT, that when I relax the muscle it doesn't quite feel like I'm relaxing it, and furthermore the leg begins to tingle. The tingling is a really intense sensation (no pain) and it used to force me to stop because of the intensity. I have since regularly practiced holding the tingling sensation, so now I can keep it going for some time. Nonetheless my body actually makes an involuntary twitch. Its is like the leg muscles become relaxed, so they involuntarily contract in a series of twitches (sometimes average and sometimes rather powerful that make my whole leg jump). It makes me think of how one's legs twitch in REM sleep when the body is unsure whether limbs are alive or dead because they are so still/relaxed. Any ideas what this may be? Neurological damage/condition (I hope not)? Just another strange symptom of years of anxiety and stress (stress like I'm 20 and have grey hairs)?

PS when I smoke weed (which seems to exacerbate my anxiety AND relieve it at the same time) the leg twitching gets out of control and in addition, my whole body shivers.

Give me as much feedback or thoughts as you can, thanks a lot. Sorry again for how long this is, thanks for reading all of it, haha.