Why do I feel strange after my first sauna session?
Sometimes people experience healing reactions during their first couple sauna sessions. This can include temporary moodiness, nausea, or fatigue that typically goes away right after the session. Take it easy, and if these symptoms persist, see your doctor.
It could also be that you are dehydrated. Your body loses a lot of fluid during sauna sessions, so be sure to drink 2 glasses of water before and after.