Google "Bacterial Vaginosis". I had this a while back when I was about 19. Kinda sounds like what I had. You get it from using soaps with fragrance and it messes with the pH levels in your vagina. It kills healthy bacteria and the harmful bacteria multiples. That's the only thing I can think of. I dont remember the medicine I was prescibed but it went away within a week! My doc said it wasn't an STI/STD but she said that we could still pass it back and forth to each other...(That confused me) I'm not sure about the mouth and tongue thing or if its related. See your doc and dont be afraid to tell them everything! I know I used to be afraid and embarassed to tell my doc what was really going on but thats the only way to get better! They won't judge you! They've seen WAY worse things, I'm sure!
Until then, take the meds and try to stop having sex for a little while so both of you can have time to get rid of the bacteria! Good Luck***
(Im not a doctor, this is just my personal experiences, and what I did to get rid of it)
Sounds like an irregular period. My advice is to go see your regular OBGYN and ask if they'll check your thyroid and hormones. The reasons your periods are "off" is because of a hormonal imbalance (whether due to stress or something else).