Finally got a diagnosis but now I have to navigate a disability I know nothing about

After a year and a ½ of not knowing what's happening to me I finally got a diagnosis. I still have to get a diagnosis for what specific type I have, but finally I know why i'm so sick. I'm here to ask other people if pain medication works differently then it did before getting dysautonomia. Do certain pain medications not working anymore? I specifically use a lot of tylenol and I want to know if other people have issues with tylenol not working but i'm interested to know about pain medication in general and if it's less effective.