Ok I doubled checked my numbers. For reference, here's
the diagram I'm comparing to. Here's your numbers:
upper retropalatal:~11.4mm (normal is 15-20mm)
lower retropalatal: 13.6mm (normal is 10-16mm)
upper retroglossal: 9mm (normal is 10-17mm)
I didn't both measuring your lower retroglossal space because your face is so long it's completely outside the bounds of obstruction but strictly speaking, it looks more than adequate. My airway is almost identical to yours, except your lower retropalatal is few mm bigger than mine. See how your mandible plane radically changes behind your molars? It's the reason for your weak chin.
I suspect your case is bad enough that any sleep lab could pick it up but to be sure, see if you can swing by Stanford or look for the biggest center nearby if not. Check that they can diagnose UARs. Short term symptoms to watch out for are nocturnal bruxism, tongue thrust, nocturnal reflux/acid damage, morning headaches, chronic fatigue, somnolence, nocturia, elevated blood pressure, and anxiety/depression. Long term symptoms are... just bad. Other indicators would be a high malampati score, high/narrow arch, oversized tongue (w/scalloping), and long soft palate.
Please remember to return and let us know the study results! Even if it comes out negative, try to remember that it's age/weight dependent so you should recheck it every decade to make sure it stays that way.