Basically eating and drinking and pooping are your big markers of health. If you got that then everything else is incidental. I'm very glad to hear he's doing well. Neurological problems are usually very dramatic including choking on water and food, loss of coordination, inability to walk, head tilt, drooling, no bowel movement, inability to eat or drink from a syringe, seizures, that kind of thing. If everything is normal today I don't expect anything terrible is going to happen. These things tend to get better not worse over time. Be very careful because the next exposure to heat may not be as tolerated.