Ok, not so much itchy.... But I've got no idea where to ask and how to start it.

Alright, for the past week, I've started to get very sore 'down there' and having my belly popping out, I can't see what it could be.
TMI coming!
I know it's not a UTI, but it's not burning when I pee (only burning when I pee when the pee has finished) and it REALLY hurts to wipe because it feels like I've either cut it somehow (and can't think how I did that) or walking so much that it has been chaffing me down there and.. well... it's really hurting!
I've been rather horny as of late, but can't do anything about it (for me that is, not for DH) because I can barely stand me touching it to wash it let alone DH touching it.
The itching comes when the pain is more frequent, and usually the itching relieves it, but I can't keep my hand stuck down there as it just wouldn't look any good!
Any ideas what I could do for relief?