So sorry you are having such pain and with little one's to take care of. Everyone here is great and I'm sure you will get some good advice soon.
Try reading the Fibro 101 thread. (2nd from top) It has alot of information and things you can try to help. I don't know why your doctor's office would tell you to get used to it! They sound like they are telling you to give up and there are things that will help.
I went through the waking up all night, still do sometimes, but I did find out I had severe sleep apnea. Getting treatment for that has helped alot. I always try and take a hot shower or bath in the evening.(which I see you already do) It seems to help me relax.
Another thing that has helped me is the stretching exercise mentioned in Fibro 101. I hope you can find more that helps and I would also let the doctor know that you are not getting rest at night. If he won't help, maybe it is time to get a new doctor who is familiar with Fibro and can help you.
Good luck & others will be along to give you good advice.
Never regret something that made you smile!