The entrance of my vagina is a little swollen, whitish gray thin discharge, no smell n it hurts when I pee n itches. NOS. Is yeast or more serious?

See doctor or clinic. Any abnormal or new vaginal discharge should be professionally evaluated. You describe mixed symptoms both for and against bacterial vaginosis (bacterial overgrowth) and yeast. It could be another infection, such as an STD if you're at risk (new partner, partner who has sex with others, etc). Simply no way to know without professional exam and testing. See your doctor, or local NHS GUM clinic.