I read this and my heart went out. (Just what you wanted to deal with after the birth of your daughter, right?)
I have extensive scar tissue after my daughter, (epidural, 15 minutes of pushing- but I didn't rip on the outside- just 'healable' trauma on the inside.) I noticed the same issues.
The first thing I would do is call your insurance company. I would explain that you were NEVER spoken to by your doctor about what you are now dealing with. I wouldn't go into crazy details, but I'd make sure they had it on record. Then? I'd contact hospital admin, or your doctor admin. I'd explain what was going on, and see if they can get you a patient advocate if the doctor isn't willing to fix it, without suggesting a plastic surgeon.
I'm so, so sorry you are having to encounter this. I think with talking to the right people, it will go a long way.