JessicaDodge once bubbled...
I am an old pro at vomiting under water... I do it every time I dive. The first time I did it in the regulator (like my instructor said) and just purged it well afterwards... the other times I took the reg out cause it just seemed gross. I just made a concious effort not to breath back in and did fine. I think with the regulator in is probably safer.... but with it out is a lot less gross. SO you can either take the chance of dieing or be gross and have your reg serviced if need be.
Jessica
You are fortunate that each time you had complete control over "involuntary" reflexes. The modern regulator designs - include an exhaust diffuser assembly large enough and capable of handling vomit. ALWAYS KEEP YOUR REGULATOR IN YOUR MOUTH (except when taking pictures <lol>). Basic maneuver is bite down on the mouthpiece with teeth- then vomit away.