sounds more like a form of separation anxiety to me rather than a tantrum. we went through the same stage - makes it tough to quickly run to the toilet even though 10 months is still young, i would always tell my DS that i was going to do x & that i'd be back in a minute. then when i came back i'd talk to him again. just reassuring him that when a parent leaves the room they are coming back. i'd say he needs the reassurance of cuddles/a response & that it will pass over time. imo, it's good to give them the reassurance till they pass the stage to help them feel confident.