Oh dear!
First - that pain could be thrush, have you & baby been checked out for that?
second - Nipple damage suggests a problem with the latch. Has baby been checked for tongue tie or other issues that might affect latch?
Also, if it's only one side, maybe it's a mobility issue. You could try chiro or osteo to see if that helps. Do you use the same hold each side? If you use cradle hold on the 'good' side maybe try football on the bad side...?

If your nipple is damaged, it's normal to feel some pain at the start of the feed, but it should ease off and disappear. Pain after a feed could be thrush. Could also be vasospasm (particularly if it's cold). Have you seen IBCLC LCs at those clinics? Might be worthwhile getting a recommendation for a good LCs in your area.

Really hope you can get that pain sorted soon - it's awful, I remember from DS