K, I'm sorry you are having this miserable problem. Flares vary in length. I'm in one now and it has been going on two months. I probably have another month or so to go. I usually have them this time of year. Where I live, I get a lot of rain and fronts going through in the summer so it's my worst time for fibro. But, just hang tough. It will get better!
Try using moist heat, rice bags, and gentle stretching exercises. These can be found on the Fibro 101 thread. Keep moving! If you sit too much, you will get much stiffer. Walk as much as possible.
I use ibuprofen (with food) and Tylenol to help with the pain. I also take malic acid/magnesium supplelments and they have helped me a lot with pain and fatigue. I bumped the thread about them this morning so check it out and see what you think.
I hope you feel better soon.
Sherrine