Your Fibromyalgia is no doubt from hypothyroidism. So too is probably the OA. They all commonly go together -- especially as time goes on without proper thyroid hormone replacement. Please find an integrative doctor who knows how vital vitamins, minerals, and hormones -- in balance -- and will help take control of your hypothyroidism (as well as helping others from ever acquiring it).
You are not alone in your condition. Many others have a myriad of "illnesses"or "syndromes" along with their Hypothyroidism. I found this thread on the prevalence of people with Fibro, OA and Hypothyroidism:
The thing is that hypothyroidism has a myriad of symptoms! When doctors don't understand those symptoms are all related to the lack of thyroid hormone in the body on a cellular level, they simply give the malady a "name" and give you another pill to take. Of course, the pill won't do anything to help you because it's not thyroid hormone, which is what you need! The pill may seem to help quell symptoms, but it's not doing a thing for the root problem. You'll know that as yet another "syndrome" rears its ugly head.
For millions of those with hypothyroidism, T4 cannot be converted and turned into T3 for the body to get it. This is most often caused by nutritional deficiencies. We need nutrients (as well as a good gut) to convert T4 into the active thyroid hormone called T3. This is why you probably can reverse all those maladies by way of using T3. Your body needs it.
With the proper tests, it can be discovered whether or not you are properly converting T4 into T3. The link below is a great article to help you understand the need for T3 in cases such as yours.
Please research T3 Therapy right away. You need it. It is possible you may get your doctor to prescribe either an NDT product that has both T4 and T3, or possibly T3 on its own. If you are not able to convert T4, the T4 in the NDT could turn into Reverse T3 (RT3). The article above explains that.
I'm so sorry you are having these issues. The vast majority of conventional doctors have no clue about what you need to become well.
It's not "breaking news" to me, but many have found that fibromyalgia can be treated with adequate thyroid hormone. I am one who knows it is true! You must get T3 into the cells as every system of the body needs it to function properly. If you have been low in T3 for a long time, that explains why you are also are symptomatic of Fibro and OA.