Sometimes I get random spasms in my mid-back, similar to a Charlie horse (which I never get). It comes in very suddenly and is really painful. My husband will massage it for a bit and it helps, but then 10 minutes later it'll be back. Last night I had to sleep leaned halfway into my back with a hot pad underneath. Anyone else have experience with these? Any wisdom to share? I'm 30 weeks and carrying on the lower side. I already wear a heavy duty brace for my PGP.