It sounds like your trip to DR disrupted your health in quite a major way – so I would take things as easy as possible if I were you. Time to call on some support for yourself (as you have been very supportive of others in the past.)
Good that you are getting medical advice and are able to rule some issues out. I think it will be a relief when you are able to pin the cause down. Keep posting and keep us updated. Hopefully chat soon.