Is my Rainbow Boas dying?

[Chelseafeatonby]

About 6 months ago I bought a Rain Bow Boa off of an old couple. He has been perfectly fine, very tame, lovely colour and shine to him. He's around 10 months old and about 3ft. He had a problem with feeding for the first month and I had to assist feed him but he has been fine recently strike feeding 2 mediums a week. His viv has always been fine and humid for him.

2 weeks ago my other half bought me a speckled red tail boa for my birthday - hatchling - he's in his own small viv.

A few days after this I noticed some mites on my rainbow boa, I don't know if this is a coincidence or not. I took everything out of his viv, cleaned and hoovered it and put this water bowl and hiding cave in the oven.

I've been bathing him every other day and wrapping him firmly in paper towels and everything has seemed fine.

I went home on my lunch yesterday and checked on him - he seemed limp and for a moment I thought he had died. I put him in his water bowel and he started drinking and opening his mouth really wide like he had something caught on the side of his mouth or so to speak, like he was gagging.

I immediately cleaned his viv out gave him fresh water and sprayed the tank. This morning he has moved from his usual spot so it looks like he's gained a bit of energy and has been able to move.

Do I leave him to see if he perks up over the day or do I seek some sort of help? I did go to the local vets last weekend and they said to have a look online at forums and buy some mite killer online but I'm scared to as I've read about peoples snakes dying because they've used the mite repellent in the wrong way.