### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
My fiance is an ultramarathon runner. Extremely fit. He runs 15 miles like its nothing. Yesterday he went on a standard 17-mile training run. He made it five miles and pretty much crashed. He tried to tough it out, but actually ended up getting severe diarrhea and passing out on the side of the trail for a while. He almost had to crawl the last 7 miles to his car. He says he was well hydrated. He was careful about his salt levels. He ate a good breakfast, and he eats plenty of meat (chicken, fish, beef etc). When I got home from work, he was curled up on the couch, shaking and taking frequent, sharp, shallow breaths. I asked to take him to the ER and he refused. He fell asleep for 2 hours, breathing that way, and when he woke up, he started crying(He does not cry)! He seemed to get his energy back, but this morning, the effort of getting ready for work left him short of breath, and he was complaining of abdominal pain. He went to work anyway. Help!

### output:

Hi. Thanks for your query. Read and understood the history about your fiancé, his running stint but a sudden attack of pain in abdomen, crying, and diarrhea. This looks to be case of enteritis, meaning infection of the small and large intestine, the third-space loss of fluid into the intestines can be liters and not understood till one vomits and / or passes loose stools, this is rich in electrolytes. I would suggest you the following:Ask your fiancé to attend the ER for checking up the vitals, abdomen, lab work and then decide whether he should continue work or get bed rest and medicines or get admitted. This will be decided by the condition he is in.