i agree with Kmn, sounds liek thrush, maybe go to your Drs, calling the ABA probably wouldnt hurt either!
I hope it feels better for you soon, i know how yuou feel.
In the whole 4and a half months that i bf my DD it hurt evrey single day (one of the reasons why i stopped) in the beginning the thought of feeding her made me cry
It will get better for you tho xx