How To Control Fibromyalgia?

I was diagnosed with Fibromyalgia at 18, am now 20. I've wanted to get in shape, and have tried to several times starting slowly by going for short jogs. But with my fibro combined with my asthma, I can't even jog a half mile without feeling like my legs are going give out. Fibro is also starting to interfere with other life aspects. How can I take control?