Sex and vag help !!!

Okay so where to start I’ve recently been having slight every once and a while pain in my vagina kinda up top and the labia area it feels like a after sex pain almost Or like something’s poking it started happening almost right after my period ended I live in the south so it’s been pretty hot lately unbearably hot and I’ll admit I’ve been eating terribly and not drinking enough water I’ve also not been able to shower for a few days because of a camping trip and having to wear tight pants to work Ik gross but any ideas what this pain could it be could it be just needs to be cleaned or heat dryness or rash because of the pads has that happened to anyone ?? I’ve put Vaseline on it and it seems to help not itch if I do my period was my normal 5 days and heavy bleeding so I’ve ruled out pregnancy and stds cuz there’s no burn when I pee and everyone I’ve been with is tested clean and the pains not constant it’s just every once and a while if I get hot move a certain way or I’ve had pressure but could it be gas or straining too hard using the bathroom thanks .’