I'm a little worried, any advice on this?!

I'm a little worried, any advice on this?

sometimes, (it just comes randomly) i get like a little wart or lump on the outside of my vergina and around my lower abdomin area, i also get strange instant pains in my lower stomach on each side- it worries me due to fertillity, i'v been to the doctors a couple times but they just say it's due to stress and ovation.
but i still get really concerned when these warts/lumps come up.
i haven't been sexually active for a while and it came up before i started having sex.

any advice or help please, thanks

Was that a standing ovation?