Ehlers-Danlos Syndrome Support Group
Ehlers-Danlos syndrome is a group of rare genetic disorders caused by a defect in collagen synthesis. Depending on the individual mutation, the severity of the disease can vary from mild to life-threatening. Common symptoms are unstable, flexible joints with a tendency to dislocate and subluxate, and elastic, fragile, soft skin that easily forms welts and scars.
If I were you, I'd keep trying physical therapy, maybe from a different place. Some exercises work better than others (for some, that's aquatic therapy), and it can take a long time to build up muscle strength that holds together an injury-prone body. Also, I'm 99% sure your doctor is right about narcotics, based on your age alone. There are other categories of medication (including supplements) you can take that might help a little, but if you focus on getting stronger, avoiding unnecessary activities that cause pain, and changing chairs/mattresses/pillows, you'll benefit much more than from narcotic pain meds. Lastly, you probably should insist on seeing a rheumatologist about POTS.