Recently diagnosed with asd. now, anytime i have a medical issue i'm told it's anxiety/all in my head. i feel as if they're not listening and i stopped going, because i know it's pointless, even when it's bad. how do i make a doctor listen to me?

Some basics. You need to find a life coach that cat teach you stress management and relaxation. They can also explore the many issues that bother you and how you now manage them. Docs can only comment on what the history/exam and tests reveal. If that is not in line with what you presume is going on there is a problem with some part of the exchange. Do the work & life can get better.