losing weight, worsening memory, tremors, tiny muscle twitches, what's up with this? 20 years of age?

I've been having progressively worsening memory, a permanent "spaced out" feeling in my head, trouble concentrating, a bit paranoid feeling, and episodes of insomnia over the past year. I've been seeing doctors for this, however none of them have been able to help me. I recently had a trip to the neurologist and explained my issues but all I ws given recently was an ncv and emg, with no diagnosis or abnormalties found. I fear I am losing my mind at a young age and have read about things from cjd to early dementia and even genetic causes even though I don't have a family history of mental illnesses. Please, wht do you guys think? I have a second neuro visit in a bit to investigate this more but don't have the funds or even insurance to keep this up for long.