Keep everything how it is till tommorow, then go out and buy a heat pad and a thermostat, or last resort a lamp dimmer set to about 90º, and an accurite or something that is digital and measures heat and humidity.. put a damp towel over the top to keep humidity in overnight. Don't mess with him for a couple days, then you can weigh him and check him over carefully..
If the rats look healthy don't bother with worrying about mites from them.
Also don't bother moving him to feed but it doesn't really matter either way. it's not nessecary.