Went for a long hike, rough terrain. not in shape. i take lithium. i got overheated, nauseated is this sign of li toxicity? had lots of water n shade

Nausea, dehydration: Nausea can be one of the initial symptoms of lithium toxicity. Getting overheated and dehydrated is often a cause of lithium toxicity. However being on medications like Seroquel (quetiapine) and Lamictal can also make one feel a bit nauseous if dehydrated. It is vital to keep oneself well-hydrated when on meds like these. Glad you are ok now.