Quoting Jane Lynn:" these are worse than when i got my 1st baby girl.. i cant walk threw them i have to pretty much just ... [snip!] ... the other hand this whole pregnancy has been hard.. i lost my plug at 32 weeks was thinning then also.. this has been so hard.."
With my first I lost my plug a couple of weeks before I had my son. If the pain is that bad, see if you can just go in to get checked. My first pregnancy was horrible for me, like you I have a really high pain tolerance. It's surprising how different your pregnancies can be from a previous one. This one I have my uncomfy moments, same thing every pregnant woman goes through, but thankfully it's NOTHING like my first. If you can, soak in a hot bath, that is what I always do when I can and I'm having contractions. It won't make them go away, but it makes it easier to get through.