std??

I feel so embarrassed bringing this up. I'm also questioning if it's possible if the ER does std testings. I'll explain my symptoms. I've been having a lot of whitish-light yellow discharge these past 3-4 days it's pretty much to the point it's mandatory to wear a panty liner or my underwear could get really wet.. and it burns when I pee, but it's ONLY when I pee. Like I feel the burn right at the opening of the vagina if that makes sense? and it just goes away like a relief feeling when I'm done peeing.. I was at the ER recently and they said I didn't have a uti or yeast infection.. what do I do? I feel so uncomfortable with everything right now.