Yep have had it for quite a while, it was sparked off by having Lupus.
Worst thing I find is having anything very acidic (I cant drink wine anymore, in fact find all alcohol makes me hurt)
If you have lots of pain, Synadol helps, although I dont take it as find my Lupus meds keep the pain under some control, I know Saltire finds it helps.
it does come in flares I find, can be not to bad at times and hen lots of pain.
I have terrible Insomnia with it, others find they sleep all the time. I was prescribed Amitriptyline but didnt find it helped just found it made me groggy the next day, and over the years have learnt to live with the lack of sleep, think your body gets used to it to be honest.
I have found keeping a positive point of view about it, has been the best thing to help.
But I am the sort of person, that wont let it beat me.
Hope this helps a bit, there is a few of us here that have it, so you have company.
There is also a FB page.