Had no discomfort from my fibroid tumor until i used my dildo.now my lower stomach is sore.it didn't hurt when i was using it.why is this ?

Fibroids can hurt: Fibroids can cause pain with deep penetration. They can sometimes hurt more than other times because of where you are in your cycle, or if they are particularly inflamed. Nsaids can usually help with fibroid pain.

Sexual excitement: The female physiology of sexual excitement allows the cervix to elevate up out of the vagina, as well as the vagina expands by one third with lubrication. Once the big "o" (orgasm) occurs and the flood of neurotransmitters are gone, pain is more perceptible.