PinkLilly, I'm really sorry to hear that you don't feel supported right now
If you're unahppy about this, or just unsure, why not give yourself a little space and see how you go. You don't have to give up if you don't want to - it sounds like things were actually going pretty well for you this time. Even if you've given him some formula, or if you don't breastfeed exclusively, it doesn't have to be the end of it if you don't want it to be.
You do need to get some help for the cracks though and the pain in your nipples, either way.