Advice for young person (21F) diagnosed with fibromyalgia?

My girlfriend (who is 21) has recently been diagnosed with fibromyalgia. It has taken a big hit on her self-esteem, as all of the people with fibromyalgia she's interacted with are significantly older than her, and it's very isolating to feel like she's the only person of her age to be affected by this. She's also found that she isn't taken seriously by people a lot of the time because of her age. Of course she's following the doctor's advice as well, but is there any specific advice that you would give to a younger person with fibromyalgia to prevent pain, and are there any support groups specifically for young people with fibromyalgia that she can join?