You must be frustrated and worried. I am sorry to hear this. First, You are amazing and you are doing a great job, so just do not give up!! There is a wonderful book, "Breastfeeding Made Simple" that can help give you some tips and can certainly also just let you know that you're doing such an amazing thing for your baby.
Just remember, Breastfeeding is not as easy as we are all led to initially believe. Just because woman have been doing it for centuries...does not mean we are all "naturals". It takes work!
One thing that may help, just relax. Perhaps, stop "thinking" and start just "doing". Do what feels natural. A great latch is imperative to successful feeding and is also so much less painful to you! Prop yourself up on soft and comfy pillows, grab a soothing beverage, put on some amazing music and try to enjoy the experience. Be comfortable and be pampered. A happy momma makes for a happy baby.
It is hard for milk let-down if mom is upset and/or stressed out. This sounds so hypocritical in a way, because not being able to feed our babies is certainly due cause for being stressed out. I am just saying to try not being tense - I am in no way passing judgement. I know, first hand, how upsetting it is when we try "everything" and "nothing" seems to be working.
Breastfeeding is the best "gift" a mom can give to her baby. You are an incredible woman to continue, despite all the issues you described. There is nothing better than human milk, no matter what we are told about formulas. Now that you feel that you have a great supply of milk, just let everything else go and feed, feed, feed your baby. Practice makes perfect...
Our son needed a frenotomy, too. I feel proud that he nursed for over a year. Did your child just have this procedure? Perhaps he/she is just feeling things out with a "new" tongue...
Perhaps forgo bottle feeding and try breastfeeding exclusively, as this could be confusing to baby.
Rest assured, if baby is pooping enough during the day, he/she is getting enough breast milk! Do not count "wet" diapers...as who the heck knows these days, as our diapers are so darn absorbent it is hard to tell!!
Hang in there!!!!
Also, just because you have already had lactaction consultation visits, does not mean that you can not have any more. They are there to help and assist and would love to continue to support you in your efforts. Please just continue to ask for help. You deserve it and so does baby.
Good Luck!!
(I am in school to become a lactation consultant...so I am far from an expert, yet please feel free to contact me at ____@____.com if you have questions.)