Discharge help?

So I had my baby just about seven months ago, since then I’ve had mucus like discharge almost like I had right before I got pregnant. It hasn’t gone away and the doctor said it was normal, I however DO NOT think this is normal.. since then while getting my period and using tampons my vagina has been feeling painful. Not regular cramps or cervix cramps but the inside walls of my vagina feel sooo sore. I was thinking maybe it’s the tampon? Or possibly it have something to do with the discharge or a yeast infection/Bv? My discharge isn’t cottage cheesy it’s more like a booger. Any of you ladies know? Also, should I switch tampon brands? I use Tampax pearl but would be open to other options. Help a girl out!