I apparently have some fibroids, but have not experienced the symptoms you describe. I am not sure that my experience is significant though because each woman is different. I think the muscle stretching thing is something to consider too. I now that we have a lot of exercise doing it. I really love sex as long as there is adequate foreplay and stimulation which my husband seems to provide quite well. We are fairly active though I suppose, (2-3 times/week) and I suspect that has a bearing. Like anything muscles that you do not use very often have a way of complaining if they are suddenly forced to be more active
I wish you well in your relationship with your husband and my prayers are with you