You poor thing! I had a tough time starting BF, but I stuck it out and EBF to 6 months, then continued through weaning to 13 months.
Our start was especially shaky as I got mastitis before DS was 1 week old. That took quite a few rounds of antibiotics to clear. Even so, I think I had sensitive nipples, because they felt like the "nipple stem" (my invented word) was sooooo bruised. DS was considered "borderline" for tongue tie, and since we had such problems already, they fixed it rather than not.
I expressed when the pain was too bad, and DS got expressed milk. As I was still building my supply, I was told to keep pumping for a while after nothing came out. Doing which I gave myself oversupply... But DS only had a little formula in the very early days. From then on he only got my milk.
I used lansinoh religiously, every feed, for months, and it helped a lot! So did paracetamol...
You need to find a BF counsellor or health expert who you click with and who it feels like is helping you. Keep trying the help lines and if there are any drop in centres near you, use them too.
For me, I consider the worst was over at about 9 weeks. Don't know if I would have managed to stick it out that long if I'd known from the beginning it would take that long, but each day you think "tomorrow will be better" and hang in there.
Good luck! Stick with it as long as it feels right for you and your baby. It will get better!