How can you clear up vaginal odor if a few months ago you had a tampon in for longer than you should have and your original vaginal smell has never been the same?

Hope you got it out of you. You need to see a doctor because it sounds like you may have an infection. I also suggest you use stick-on pads such as "Always Wings" (over-night ones for heavy flow.) Tampons aren't that healthy to wear because it does rub on the fragile tissues inside.