I have no experience with this issue but I do have experience with trying to get in to see the dermatologist. I would call every single day, say you will take a cancellation, tell them you are fearful for your mental health because of the symptoms, ask what you can possibly do to get an appointment. Call every single day till you get in. Call other derms in your area. Give each a solid story of your progression. Ask if you can show them your back with telemedicine. Do not give up. At some point, you may wear them down. In the meantime, avoid all pressure on the areas, only cotton next to your skin, try lidocaine topical cream (may need prescription), take benedral, use no soap on the area, scrutinize your diet and keep calling derms till you get in. September is a long time away! Good luck, and please post updates for those who us who are now worrying about you. I do not believe this is a matter for a family doctor unless your family doc can get you in to see the dermatologist sooner.