I've not had sex in months but last night I had yellow discharge, it doesn't smell and it hasn't happened before, it doesn't itch, at points there was a lot and was watery, other times during the night it was thick and noticeably yellow. Help?

Sounds like a bacterial infection or std of some kind. Vagasil has a test. It will tell you what your ph level is. And whether or not u need to see a GYN. I recommend going to the doctor or clinic ASAP. Good luck