Hi there, Im so very sorry you are struggling. I have experienced brutal pain as well with no clear dx. I do know about a cushion though. They are called tush kush and they have a "U" shaped centre missing for the tailbone area and are soft and its can be carried anywhere. Worth a try. All the meds are no lasting help, I get it. There is a link on one of these chats to a physio therapist overseas"TOR" Trening Og rehab with some tips for this issue (as it sounds like youve been diagnosed) with 4 exercises and Nakktase and Serrapetase supplements some folks say helps. Take care for sure as it is just awful to cope with.