Interesting- I did not know you used that term 'jabs'. I do know it seems to throw UK folk off when we use the term "rubbing alcohol", which is isopropyl alcohol..... or the kind they 'rub' on your arm before inserting the syringe. And yes, the most common term would be getting a 'shot' to mean an injection.
The way you are using the word 'sick' and 'ill' would not work quite right here. We could and occasionally do use the term 'sick' for vomit but it would need helper words such as 'had an upset stomach and finally got sick at 10 o'clock' to make it work. We just use the words 'sick' and 'ill' to men "unwell", not any specific physical act. In fact, usually not at all related: Taking a 'sick day' from work usually means a cold, flu or similar and does not infer vomiting at all.
The idioms for vomit kinda' sorta' explain themselves. I guess the one I would use most, in a crude setting, would be 'blow lunch'. More respectable circumstances would either be 'throw up' or actually vomit to mean vomit. :-)
Brian
couple more that have come to mind for one reason or another.
Injections. We would say we're going for our jabs, I believe you guys refer to them as shots (which I associate with alcohol)
Loosely related ( as it can happen after consuming too much alcohol) is vomiting.
Typically we would say " I'm being sick" or "I've just been sick" however depending on company then you might also "chunder" ,"spew","barf", "make a pavement pizza", "puke", "throw up" or even say " I'm just going to answer/use the big white telephone"
WHat do you guys use?