Thanks again so much for all the replies and suggestions on my melt-down post from yesterday. Just for a little update, I've kept at it apart from one feed in the night last night where DH gave him formula and I had a snatch of sleep. My nipples are both completely 'popped' at the ends and feeding is agony.
Saw LC again this morning who said that the kind of damage is very typical of tongue tie, and she has suspected one but it's been hard to get a look at.
So I'm expressing for now because it's impossible to maintain a latch, however good. Fingers crossed we manage to get referred to have it snipped ASAP.
Does it hurt them to have it done?