My father will take spells every now and then, and its very strange. Some symptoms lead twards a possible ulcer, but some of the symptoms aren't exact of course. He has horrible cold sweats, it keeps him in bed for days on end. At times it would bring him to tears, a full grown man with such a sickness it makes him cry? He vomits green, and usually liquid. And 2-4 days later he's fine again. then, after a long time without an incident, it'll happen again and through him into the same fit. No doctor or emergency room we've taken him to knows what it is, and they find nothing when they do tests. What could this be? I'll answer any questions to better identify this sickness..