What are some vaginal diseases or infections I can self treat?

Not smart to do that. The only one i would say is a vaginal yeast infection, - many over the counter meds are around to treat that, but if the symptoms do not go away you need to see your gyn because you may have something different that will need to be treated or more than 1 infection at the same time, and sometimes you can have a yeast infection and an std at the same time or the symptoms could be similar.