With my 1st I was sore 8w (ok), with 2nd I was sore for 4+ months (not ok)! I visited Lactation Consultants, LLL, pedi, OB - nothing, no ailment, no tongue tie, etc.; I figure I'm sensitive and my 2nd was a "barracuda". Although I EBF both, my 1st used paci, my 2nd used me (BF more frequently). Thankfully that passed also. Wishing you figure this out and/or that it passes soon.
TTC#1 2003 BFNs, 2004-2009 5 angels above
2010 IVF-PGS-FET#1, DD b. Aug-2011
TTC#2 2012 BFNs, 2013 FET#2, DS b. Nov-2013
TTC#3 2015 BFNs, FET#3 (my 6th and last angel above)