Hi, Belles, and welcome. I don't get in hot tubs but several members do and like them. A hot shower helps me loosen up. Maybe it's too much heat for your particular body. I did google this problem and there were a few others with fibro that have this same problem.
We are all so different with this illness. Yes, we all have pain in all four quandrants of the body, we have fatigue...some more than others...and we have cognititive memory problems. This is the criteria for a diagnosis once other illnesses have been ruled out. It doesn't go further because our other symptoms are so varied, I think, and some suffer from symptoms that others don't have. This is a crazy illness and this is why it's taking doctors longer to figure it out. It's also why some doctors dismiss it as an illness.
But for you, I would just stay away from hot tubs. It could be the heat, the jet-driven water, and maybe even chemicals used to keep the water safe. I have a pool and love it when it's between 80-83 degrees! Most say that's too cold and they like a warm pool but I find the cool water settles down my back muscles and I have less pain. I have a floating lounge and I get in that and the warmth of the sun feel great but yet the cool water on my back feels great, too. Go figure! But it works for me so I do this.
Do read Fibro 101... The first thread on the forum. There are links to good info about fibro and you will learn a lot there. I've had fibro for decades and am still learning new things.
I'm looking forward to getting to know you better. Don't hesitate to ask questions because we are here to help you. Hope to hear more from you soon.
Fibromyalgia, Crohn's Disease, Ostomy, Autoimmune Inner Ear Disease, Diabetes, Osteoporosis, Glaucoma, Scoliosis, Ankylosing Spondylitis
God does not give us a spirit of fear, but of power and of love and of a sound mind. 2 Timothy 1:7