Thats horrible for you, not trusting your hospital, I mean. Adds so much to the stress. At least the NICU staff are good, and I suppose thats the most important part right now...
Also, I forgot it was the weekend - even in the big teaching hospital dd was in, ENT staff only came on ward during the weekend for absolute emergencies. Thats fairly standard, I'm afraid.
If it IS floppy larynx, then at least thats a well known, well researched thing as opposed to the 'we're not too sure..lets try this and that...' sort of condition. The ENT team, if they agree its possibly laryngomalacia, will probably do a flexible laryngoscopy - they pass a very thin, flexible tube with camera down the baby's windpipe, to have a look. dd had it done at 8 weeks - she wasn't happy about it, and did cry, but it was very quick and well worth it for the information. I'm told its annoying more than painful or uncomfortable, by adults who've had it done, FWIW.
And then, if it is that, they will decide how severe it is and whether your son needs surgery to help or not. dd didn't, though when she had her tonsils out ten days ago, they had another look at her larynx and did decide to cut two tiny bands of cartilage either side of it, to help her breathe better - as it was still pretty floppy.
If its mild or moderate, it means your ds is ok feeding and breathing, and he won't need surgery. The only difference it will make will be that he will sleep better on his side or front (we used to wedge dd on her side when she was small, she's never slept on her back), and will need a bit more vigilance when he has nasty coughs/croup/chesty colds etc. He may well also have a degree of reflux, which happens in 80% of laryngomalacia cases, and is easily treated with meds - dd took Ranitidine and Domperidone in her milk, 3x daily, till about 18 months old.
Its also stressful to hear the noisy breathing or stridor, till you get used to it
Let us know what they say, is his appointment on Tuesday?