If you still feel you can't communicate with others as much as you'd like, consider calling them briefly and just letting them know you are feeling unwell, so that's why you haven't been in touch, but you're thinking about them. Then when you do feel better and touch base again, hopefully they'll be happy to learn you are better. I've done that with a a good friend of mine. I remember months past, but she understood. If they don't, then consider them one-sided friends.