Illness/Sickness: Axolotls itching and throwing up

I've had my wildtype and leucistic for about 4 weeks and have been fine until now
As of around a day ago I've noticed both of them thrashing about and itching at their gills with their back legs, I researched and still have no clue of what's wrong with them
This will go on every few minutes

As I was trying look at their gills I noticed that the leucistic had thrown up a few of the bloodworms I had fed him earlier today which made me worry even more

Their gills aren't facing forward, their tail isn't bent and I change their water everyday. They also don't seem to have lost weight.

I'm worried that it may be a parasite or fungus but I'm not sure...

At the moment both of them are in tubs as their tank is in the middle of cycling and can't risk putting them in there in fear of hurting them

what could it be?

Changing the water everyday will mess up their pH and nitrate levels. That might be why their itching. What is the water pH and nitrate levels?

As for the throwing up, it could be related to stress but I'm not sure. They should be okay if they are still eating.