My bfof 4 years is pretty good about it. I told him soon after we started dating. He's been sick twice since we moved in together, both alcohol related. During each incident, he turned on the shower and bathroom fan so that I wouldn't hear, although with my emet radar, I knew what was happening anyway. He tries to push me gently to get out and do stuff, but also doesn't get upset if I want to go home or can't handle it. He also was there for me the day I drank ipecac in order to get over this fear (DO NOT ever attempt it....it just makes things worse). He was amazingly supportive that day.
The only time he's gotten really upset is the time I freaked out and went to a hotel b/c I thought he vomited when he didn't (hilarious now, but not so much at the time). I think, though, that the hotel incident made him realize that I need to focus my time and money on getting treatment, because this fear is destroying my life. So we're going to put off buying a house for a while (we're currently saving up), and spend my portion of the savings on therapy. If my quality of life sucks, what good is a house, right?
Anyway, welcome to the site.
Ultimately we know deeply that the other side of every fear is a freedom. - Marilyn Ferguson
Habituation always defeats fear. - Edmund Bourne