Son chokes every time he eats

My 7 month old is sick & every time I feed him a bottle, he chokes to the point he’s gagging and can’t breath. What do I do?

He also chokes in his sleep and I have to run over to pick him up and pat his back to get him to breath.

He doesn’t have a fever.

His cough sounds painful & his nose is very stuffy/runny.

He got shots last Monday so I’m pretty sure that’s where he picked up a virus. (At his doctors)