Anxiety or something more serious?

Hi. I'm a 17 year old male. Before I start, I just wanna say that I know I should see a doctor so don't mention that because I will, just want some insight.

Okay, so I live with my parents during the weekends in an apartment for the time being, and at my grandparent's during the weekdays for school and work purposes. I feel like this apartment is very small when I'm trapped inside for long periods of time, and I've recently been staying an extra day or two starting last week, so I'm here for 3-4 days a week.

Starting about the last week or so, I've noticed I've been feeling random spurts of pain in my arms, hands and legs, along with a reoccurng pain in my feet, my left specifically (which has been occuring for months now). On top of this, I've noticed I have a real shortness of breath when I'm not in motion or when I'm thinking about it. I honestly don't have the best diet on earth, I do intake a lot of sugar so I'm afraid I may have diabetes [like I said, I'll be getting checked out] but I'm just really nervous at this point. I was wondering if.these sound like symptoms of anything serious/life threatning (ie heart attack or diabetes) or just anxiety/stress of clausterphobia. If I don't manage to get into a doctor for a couple weeks am I at serious risk? Please help me and thank you very much!