Hi and welcome.
First, if there is a vaginal infection
it must be treated.SOmetimes it can lead to complications. Cramps are something usual in such late pregnancies and it shouldnt woory you. Uterus
presses not only nerves, but colon
and stomach too. So just be relaxed ,eat easier food , drink enough fluids. ALso do frequent US check ups of baby as well as abdomen . I am sure that this is nothing serious. Wish you good health.