Hello again all, I am looking for your advice please

I adopted 2 rats a few weeks ago from my local shelter. They are 1 year old males and they have seizures, which I was told about. Sure enough they have had a few each. I found that with extensive free range time they had much less seizures. However, las night I was staying overnight with family. I made sure they had 2 hours free range time before I left. I got back today and something has changed.
Monkey was in his bed and Stripe was on his back legs, hair raised and baring his teeth into the bed. They normally get on brilliantly and look after each other during seizures. They then started fighting. We stopped them and one went into the bed and Stripe sat on top of the bed. I went to take him out, he is usually very friendly, and he went crazy. Really scared and struggling so much. I put my hand to him and he bit me. He doesn't bite usually, just test bites. But this was a big bite.
His personality has completely changed. I put his brother on top of the bed with him and he treated him like a rat he didn't know and went for him again. I have put Monkey in with my lone rat Bear for the moment so he doesn't get hurt. Bear isn't too happy because they have only met a few times but they are sleeping together now. Stripe is resting by himself.
Any ideas? I figured he might snap out of it after a rest. Anyone dealt with this before?