Boyfriend doesn't understand?

I have chemical depression and restless leg syndrome. I also have anxiety and stress easily. I have been this way since I was a little girl. ( Was in therapy and to a neurologist for a long while.) I tried to explain to him as to why I have to move at night, (the rls) and it turned into a full argument. he argues that it's all in my head and that there is no such thing as any of that. Sowhen I show him research about it, he says its all made up by people who just want money from people. I'm tired of havin to defend myself when he gets upset with me about my health issues. what should I do?