Shutdown and don’t know how to handle it

Dear All, I got into a long shutdown, it has been 4 days. I don’t know how to get out of it. Before my autism diagnose I thought it is a cold I catched or some strange virus. I blame myself, I invited on last Sunday 3 good friends, we ate lunch and talked, they stayed 9 hours but it felt right and I felt less alone and then here I am with major shutdown, I lie in bed and I can’t do anything. Maybe it was to big sensory-wise although the lights were dim and we listened to the same 5 songs cause otherwise I wanna cover my ears. Please help me out with some kind words and suggestions. I wanted to be clever about my new knowledge and here we go, shutdownDisappointed