Just being here on this site will help you a lot. I have PTSD, and I understand that fear. I get really stressed with other people around, if they are talking loud or swearing. I like being by my self. As for things to do try visiting your local library. I have a computer at home, but sometimes visit the library just to look at books and use their computers. As for making money, can you do housecleaning? It is one job where you generally work alone and can do it at your own pace. I did it for 16 years.
Anyways, I get fears of hurricanes ( I am in Florida), trees falling on house, and mostly of angry people. I too grit my teeth and get bad pain in stomach. Often I play my favorite music, watch a movie, eat my favorite comfort food, call a good friend, do some gardening. Anything that takes my mind off my worries and anything that I can let my mind go blank so I do not have to think. My favorite thing to do is going for long walks. Hope this helps you. 1Girl