I think you’ve posted a bit in the past about health concerns, so going to the vet on Monday is a great choice.
Your vet can better find the cause, but since both your rabbits seem affected (could be a coincidence though), I suggest bringing a small sample of their shared supplies so your vet can glance and see if anything seems askew. So litter, bedding, hay, pellets, etc.. anything that may cause airborne distress or is ingested.
Until then, make sure they’re both eating and using the restroom as usual. If there’s no poop for a day, go to an emergency vet. If there’s no appetite, you need to force feed critical care.
If there’s difficulty breathing, see if there’s any noticeable discharge around the nose. You can use a slightly damp q top to tease snot away from the entrance. Just be gentle and don’t go into the actual nose.
Recording and videoing the squeaks and noises is wise as well, as I know you’ve mentioned this to your vet already!
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.