I suffer with this even when Im not pregnant but it always got worse when I was pregnant. I use a cooling peppermint gel from the body shop which is amazing if your looking for ideas to help it
Lavender essential oil helps!! But I've heard you should treat the source , I can't remember with what though, maybe magnesium or something. .. maybe someone else will know!!
I read its a magnesium deficiency, my midwife didn't know if my magnesium tablets were safe to take though so I gave up on my. I have heard chocolate is a source though...