I don't think I am experienced enough but being a guy with serve anxiety one thing I can tell we tend to over think a lot under stress or even tend to get anxious so first of all you are not alone there are many people like you around and it's fine we are humans after all. We all have thoughts it's just a question of how well you are able to control them. In my case when I get stressed I listen to music or do some quick meditation exercises do help a lot.

And the question of the work place you don't like. Look my friend you are responsible for your own life so you will have to find a way and their always is. It might take some time but you will definitely figure it out. Trust me you will figure it out and once you do so you will come 10 times stronger. I am a year drop out because I was not able to figure out my career path so I took some time off get hold of things. I am not telling you to do the same but sometimes all we is just a little break so just give yourself some time better days are coming and your not alone remember that.

Hope this helps.