I am sorry for you OP that you have to go through this. I hope that you're followed by a mental health professional which can help you. 5 month without leaving the house is entering in the hikikomori territory. I wish I could give you relevant advices, but I assume all the simple advise simply won't work (Just like you can't just tell someone with a broken leg to keep running)

If you get better and can go out again, what do you wish to do ? Is there a sport/hobby you want to try ? Is it available in your city ? is there a language you want to learn ?