Vet trip, though him closing his eyes, especially if trying to bury himself, isn’t a big deal. If it’s too dry they try and go under, after they have had a big meal they do too, or if it’s too hot or cold. Since it’s albino, it should have very limited uv exposure or it may be feeling the effects of basically a sun burn. They aren’t very active at all, but you’re probably more in tune with his normal behavior than even the most experienced person, if you feel something is really off, then he needs treatment. I lost one of mine to an infection a few years ago that may have been saved had he gotten antibiotics sooner but since the vet couldn’t see what I did in how the frog behaved under normal conditions, he was treated for a possible impaction for a couple weeks, wasn’t eating and hadn’t pooped in quite a while, until everything had moved along and was still extremely lethargic, then they did blood work and found the infection. Point of this is that if you know something is wrong get him treated. They are tough creatures that will fight to survive to the very end, he won’t pass peacefully, he will suffer a drawn out battle with any ailment he has until his body finally gives out. Some people will say it’s just a frog, but it doesn’t have the choice it would in the wild, you took on those responsibilities when you got him.