I had a 3rd degree tear as well as internal tearing. In the long run it's agreed that I probably had nerve damage. ds is now 2.5 and I am on the mend. I found sex impossible till he was closer to 2, though it is nice now as long as we are careful. I found 3 things that were useful in helping the pain.
First was ultrasound physiotherapy, which was limited but helped. It was a hard slog getting that arranged, but a private consultation with an emapthetic OB got me into the system.
second was pain relief medication especially for nerve problems - gabapentin. originally designed for epilepsy, it's effective in neurological pain too. That was arranged through a pain management centre, but if they suspect you have nerve damage try and see if it may be an option. It was another step that helped bring the pain level down a bit.
final and most awesome has been acupuncture and acutonic therapy! acutonic is needle-free acupuncture using sound. thats directly on the area, with traditional needle therapy for deeper level treatment, though it's applied on arms, legs and feet along other energy chanels.
traditional chinese medicine believes that any scarring interrupts the flow of chi and can result in all kinds of problems. Worse for us is that the perineum has a vital point for yin (as in yin/yang) energy point. Tearing in this spot leads to serious imbalance in chi flow. Worse for me was the position ds was in that also affected my yang point near my sacrum, so I really got the nastiest case scenario. 6 months of treatment so far and worth every cent! Before seeing her I couldn't stand for long without pain, now I can stand for ages and even have sex (carefully) though running and jumping are still out.
It may never be the same again 'down there', but I am just relieved I will eventually be pain free again, and that I can have a normal relationship with my very patient and understanding DH. For a very long time I didn't know if I ever would be pain free and able to have a normal reationship, and that was terrifying. Give it time, you will get there eventually. It is a long and hard road, and I spend many days wondering "why me" but that doesn't change anything. Direct your energy into finding a solution that helps you recover. For me, the why me hasn't gone away yet, but it is fading into a less overwhelming thing as I continue to improve.
Sorry to rant, but I know how hard it is to adjust looking after a baby when you are in need of care yourself. It's even harder when the system just doesn't listen. Hang in there until you find someone who is able to help