Strange and scary scene today at French Montana's Calabasas home.

The cops showed up at about 1:30 PM after reports of a potential robbery. 

Instead of a crime scene, they found French acting so abnormally they called an ambulance. French was then taken San Fernando Valley hospital with cardiac issues and intense nausea.

He's said to be alert and awake and is getting IV treatment. He may be released tonight.

His peeps tell TMZ French has been in Europe and the Middle East recently and may have eaten some bad food while overseas.