Based on your medical history it is unlikely you will be a candidate for breast augmentation surgery. It would be a good idea to discuss your medical history and concerns with a board certified plastic surgeon for an in person consultation.
Sounds like you are dealing with a lot and I am empathetic to your situation. It is hard to determine how much surgery you need as there are no photos, but classic teaching is not to perform any types of rejuvenation procedures on patients with Ehlers_Danlos syndrome; this is because of thin, friable, hyperextensive skin and major problems with wound healing. All surgeries have risks but yours are much greater. Breast augmentation will not improve your localized pain from fibromyalgia. Having a surgery with many risks for wound healing will only make you more depressed if you have complications and add to your current medical burden. I know you are looking for ways to improve your situation and overall sense of well-being, but in this situation, cosmetic surgery may not be the best strategy for you.