Ok so we've been out this evening, DH has been mixing his drinks (cider, then a beer then two whiskys) and has just been up chucking. I'm like 99.9999% sure its just the booze, he was really quite pissed. There is that tiny bit of me thinking "oh my god what if its a bug" but I'm as certain as I can be that its not.
HOWEVER... I did manage to rub his back, fetch his dressing gown so he wouldnt get cold and get him a glass of water all without completely freaking out! I'm shaking so hard right now I can hardly type this but I'm reasonably calm on the inside amazingly!! Small victories I suppose!