I've gotten to the point where if I am not interested in that person, I don't divulge personal information. Sometimes one has sixth sense about who will accept you as you are and those who won't. I think you should wait to tell about your health issues until you know the person well. I have rattled off my illness at different times to different people. I think the best time to tell someone is when you feel that person can be a friend and someone who cares about you. Until then, you may risk having to tell each person you date about your illness. It is not worth it at that rate. I would only share such information with those who you think can be a friend first and will stick it out with you. If they are and they don't take it well still, then they are not worth it and it is not a loss for you but someone who you can do without.