Oh my god! I have been going through the same thing as you all summer long so I can relate. I recommend trying to read a book, try small exercises which can be done at home such as pushups and jumping jacks and try drinking herbal tea. This does not help me 100% but it helps keep my mind at bay. I managed to go through a whole semester with severe anxiety. I have been taking lorazepam once in a while, they prescribed me antidepressants but I have not touched them. You can also try going to places close to your house as this as helped me get through it.