HELP!!!!

So I used this lube to masterbate it’s called “a warm touch” well it was ok the first 2 or 3 times I used it which is weird because i tried to use it and the last time It gave me a chemical burn. Maybe it was burning me all along and I just didn’t notice but it burnt the shit out of me. Well it was healing and it started to itch so last night I was itching it and I guess I scratched too hard and it started bleeding. (In between my urethra and clit the biggest “open space” down there)

Now it burns a little when I pee and it’s just sore in general. So how do I help a chemical burn heal? How do I properly scratch an itchy vagina without hurting myself? how do I find a good lube that won’t do that? And how do I help the “ mini cuts” down there?