Talk to General Problems on Breathing

My 11 month old babe has been doing a strange breathing thing in her sleep since 6 months old. I have plenty of videos, but I can’t work out how to upload on this forum. It’s hard to explain but the breathing is like a spasm, with rapid throaty sounding gasps/snorts. The episodes usually last up to 30mins, and can continue on and off all night. It’s worse when she is unwell. I have sought advice from multiple GPs and paediatricians but have received different answers from all. None have seen it and are only guessing. I’m very concerned. Thank you.