Gosh, I am sorry -- SO sorry-- you are going through this. I'm also sorry for not yet responding. You need support. I don't know your age. But I think for certain, you should begin seeing a psychologist. Talk therapy helps tremendously. There are different forms of therapy that can be helpful. One that sounds like it could be beneficial to you is DBT. This is a form that talks about grounding. When you feel watched or seeing things, grounding brings you to the present and centers your thought intentionally. It gives strategies for getting through terrible moments of heightened emotion, anxiety, sadness. coping skills. relaxation skills, etc. And CBT or cognitive behavioral therapy could also really help. This involves looking for faulty patterns of thinking and challenging thoughts. The concept of doing the opposite. Feel like staying in bed? Force self to get up. I know that's very hard when depressed but small little goals to do things you don't want to helps. (text one person today . . . to make contact with someone, for example). Behavioral activation is something else I really like. So, there ARE things you like probably. Doing more of those things helps enhance mood and brings on the desire and strength to do more of it. It's healing. But overall, I don't know your diagnosis nor do you. A hyper sense of awareness is tricky.
Interacting with people IS a way to feel better. Isolation is a symptom of mental health. The idea that it won't benefit you or be worth it or that it makes you feel terrible is all wrapped up in the mental health issue. Yes, medication could be very helpful.
Do you have access to a psychologist?