Mine had a posterior tie that went undiagnosed until she was 4 months old. She clicked, constantly had a swollen belly full of gas, and struggled with my flow.
By 8 weeks she was refusing to feed at all. I was convinced she had a tongue tie, but was repeatedly told she was fine as she was putting on weight and not causing me any pain. I was told it was just a phase. I was told that because she could poke her tongue out, it was normal.
After five practically back-to-back nursing strikes, and weeks of dreamfeeding to keep my daughter's weight up, I decided to see an IBCLC who also happened to be a tongue tie specialist. I picked her because one of the things she claimed to be trained to do was posterior tie diagnosis and revision. Even before we went, I was 100% sure we were going to come out of there with a diagnosis.
Straight away she told us that N had a sub-mucosal posterior tie - meaning it was at the back, and hidden underneath her mucous membrane. Two weeks later we had it clipped.
We had one more tiny strike, and since then, nothing. She doesn't click or splutter on my let-downs any more. She feeds - any time, anywhere. Her latch will never be great, but it doesn't matter. She's happy to nurse and that's enough for me.
Please please ask about posterior tie and if whoever you see seems clueless, go somewhere else. I would hate to think of someone else going through what we did.
Our baby was a chilled baby to begin with, possibly due to a late-stage epidural, that meant she was totally zoned out and mostly asleep for the first few weeks. Once she came out of her daze a bit, I think she quickly made the connection between feeding and gas discomfort, choking, etc. And so she just stopped bothering.
It was devastating.
One thing you could try that helped us during her recovery and period of re-learning (while she was essentially still using her tongue wrong - it took a while for her to get the hang of it) was to feed lying down side by side together in bed - that helped her cope with my flow a bit while she got used to swallowing quickly, something she hadn't been able to do before. We did that from the time of the revision up until she was about 10 months old.
Now we feed sitting up. And I could cry writing that, because it means so much to me.
Please let us know how you get on.