[pretty*in*pink]

Ok, so here's the deal...
My yorkie is almost 1 year old. Ever since last night at about 2:30 a.m, he has been throwing up. After about four times I called an emergency vet and they really didn't seem too concerned about it. He's acting fine and completely normal, but it's just this throwing up thing that is worrying me. He's eaten grass a couple times in the last few days, but i'm not sure if that had anything to do with it. If anyone has any suggestions as to what I can do I would appreciate it, or maybe you can share your past experience if you've had this happen to you..
Thank you all very much!