First thing I would do is google the Charm Hold - I think it's a La Leche League article and give that a go.
The second thing I would do (in fact, probably while the charm hold page is loading!!) is call the ABA hotline for a counsellor.
I ended up taking my DD to the osteo and a cold she contracted from a cousin at 2weeks of age tightened up her jaw muscles. Quite frankly, her latch has been dodgy ever since. She's just turned 4 and if it weren't for her latch and propensity to give me oral thrush frequently, she'd still be 'feeding'. I'm hoping she can help me when my next one is born next year, but only if the break has reset her latch!
Also, a IBCLC lactation consultant is worth her weight in gold. Good luck!!