HELP!

My 16 month old is crying over EVERY SINGLE THING. At first I would run to him because he would cry as if he was being hurt or something terrible happened. He is crying over his toys falling...him not being able to throw his toys...him tripping over the rug...when I move a little further away from him...when I move too close to him...when my husband leaves... just almost everything. I try to help him out when he’s having issues with his toys or food but it doesn’t always work he just gets more upset and screams until he has tears running down his face. I don’t really know what to do anymore. After a while I let him cry a bit and just watched calmly but that’s not working. I don’t know if something is hurting him or if it’s some sort of tantrum