Dress nice, but comfortable so as to set off a flare up. BE HONEST. I don't mean go into detail with all the horrible stuff before you even say hello. But let him know. If you truly want a relationship that is going to last you don't want it to start with dishonesty in a way. But at least let him know that you struggle with something sometimes to begin with, that way if things go well and you have another date but have a flare up, and might have to reschedule he might be more understanding than thinking he's getting blown off. Anyways anyone who will be truly worth your time will understand and not be judgmental!!

Best wishes and good luck!!