If I am reading your post right, I had this in PG1 and now again in PG3 although for me it happens at the top of my uterus, right below my breasts. It is a combination of burning but, for me, it also feels numb or funny if it touch it, like my cheek or lip after a shot of novocain at the dentist. Mine is now pretty much constant.
I was really worried in PG1 that it might never go away, because it was really uncomfortable to me. It took a few weeks but eventually subsided. Fingers crossed it will again.
Ds1 (2006). Ds2 (2010). Ds3 (2012).