Anxiety
When I overthink about everything for too long, i get scared and i get anxiety. It makes me sick to my stomach.
@Lovesmile23
I feel this as well. This is your body reacting to anxiety. Nausea, stomach pain etc.. are completly normal anxiety symptoms.
Something you can try is: when you start to overthink about something : write it down somwhere. Notebook, phone, post it, it doesn't matter. But i find that writing my thoughts down kind of get them out of my head.
I hope this helps, and i wish you the best. 
@No715 it took me a while to realized that these symptoms were anxiety induced. I'm trying that as well. Whenever I feel like my thoughts being to much I write it down. It helps with accepting my feelings rather than ignoring them or pushing them away. Thank you!
@Lovesmile23
This is great! I'm really proud of you for trying!. And accepting your feelings, as difficult as it can be, is a really healthy thing to do.
Keep going, keep trying, and keep fighting ! 
Ive been battling severe anxiety and panic and fear for the past 3 weeks. Cant stop crying, cant eat and have t been able to work. Im so scared that I wont come out of it. I just want to get back to myself. Any helpful advice is much appreciated
@generousLime8025
im sorry you
@forcefulCamp1976 yes I am. Dr even changed it and it seems to be worse. I