My 1 yr old just threw up all over after we just nebulized him. is this normal?

No, but . . .: Children don't normally throw up after using a nebulizer. So, the question is whether or not a child is pretty sick and needs a doctor to re-check. If a child is fighting the nebulizer, is too excited by it, or just ate a meal, then vomiting one time is not worrisome. If a child is breathing way too fast, can't get enough air, or coughs constantly leading to vomiting, then the doctor may re-check.

Check dose/fluids: I would advise checking the dose of the albuterol and follow up with your doctor. Sometimes viral illnesses can cause wheezing and vomiting. A virtual appt is available for follow up.