You sound like I did! Stuff on me feels not right all the time.. I'm probably just a little 'not right', but isn't everyone? I did the whole I have ALS and I'm dying stuff for a while and luckily I have snapped out of it.. When one symptom stopped another started.. It began in my toes and I had bulbar ALS before I finally realized how silly I sounded..
My left foot felt weird, well I wear flats at work and one of my shoes stretched out more than the other (or one foot is a tad bit smaller) so when I would walk it would wiggle around in there more and I would walk with my foot slightly turned in to keep my shoe still, I interpreted that as my foot was weak or my reflexes were off...
Then it was my left arm, always, buzzing and shaking, and I would constantly do push-ups, and lift heavy things one handed to test my strength, left arm was weaker... Well guess what, I'm right handed so it makes sense...
Then it was Bulbar ALS because I would slur words or they would sound funny or my tongue wouldn't wiggle as fast as I'd like it to. I was always making my face stretch weird ways to see if my muscles still worked, and they did.
Now it's been a month (or two I'm not sure) since I've had any freak out and it feels amazing. I'm pregnant so weird things are gonna happen.. I got hospitalized last week for something pregnancy related and I didn't think I was dying..
And at that point I knew something was terribly wrong.. I always said oh I know 100% I have X disease and am dying.. But this time was different, I KNEW. I couldn't move and I had to leave work and it was just bad..
I'll be 21 in August so you've had to deal with this a loooooot longer than I have, but hopefully I can make you feel a little bit better knowing that I worried about the same things and I'm still alive and kicking..
And everyone else is right, google makes it worse.. My husband blocked Safari and the Google app on my phone and I just recently got those privelages back to read up on baby stuff. If I google one thing health related I get it blocked again, and that is finally what made it click for me.
I wish you the best of luck, and there are some extremely wise folks on here, so heed their advice!! :)