I agree with fuzzy882. You really need to get out of that situation at all costs.
If my spouse were doing what your husband is doing then I am sure I would be trowing up all the time too.
If your husband is sleeping with men, then I can think of no better reason to end the marrage. You also have to seriously consider the risk your taking. His behavior makes him a very a high risk for STD's that could easily be passed to you.
If your husband wants to sleep around with strange men fine, but he needs to do it as a single man, not as a husband.
I don't care if I has to swim my way back home from Thailand, I would do so in a minute. I suggest you do the same.
Louise, the way you describe it, I guess I would be vomiting too. High anxiety Will make you sick to your stomach and nausated. I think the first thing you need to do is get the heck out of there, someway, anyway.