Burning after-sex vagina

Ok, first of all: I know I should go to a doctor, I just want to know if anyone here can relate to what is happening to me. 
So here is the thing, for like a month now my vaginal area hasn't been quite rite. All of my genital area to be more precise.. From some mild hemorrhoids I've been dealing with to an extreme itch/burning in my vagina. I feel like suddenly I'm all fucked up down there. I've been sexually active for almost a year and I've experienced some urine infections but nothing some antibiotics wouldn't help with. 
This past week I  really freaked out when I felt some sort of diaper rash so I bought some baby cream and then today alert I had sex with my boyfriend it burned like hell, as if I was allergic to the condom or something, but It's weird cause he only putted it on when he was about to cum (I am also on the pill) 
Please I'd like to hear from someone who can relate.. Should I be scared???