I had that really bad a few years ago. It has gotten better...mostly on it's own. You know how fibro is. But, I was getting blood work done and they had those "stiff" foam balls for you to squeeze. They had advertisements on them so I knew the doctor's office didn't pay for them so I asked if they had any extra that I could have. She gave me one and I would use that...squeezing it....while watching television and that seemed to help keep the fingers flexible.
I hope your hands get better in a hurry. You don't realize all the things you do with your hands until pain reminds you.
BTW, I just noticed that at the top of the page there is a video about how to ease hand pain. You might want to check that out, too.
Fibromyalgia, Crohn's Disease, Ostomy, Autoimmune Inner Ear Disease, Diabetes, Osteoporosis, Glaucoma, Scoliosis
God does not give us a spirit of fear, but of power and of love and of a sound mind. 2 Timothy 1:7