Past week diarrhea after anything eaten

So here is the hx on whats going on. My girlfriend and I went to Punta Cona and ever since we have been back I have had diarrhea within 10 - 15 minutes after anything I eat. I feel fine otherise, no stomach aches really just whn I eat I feel my stomach turning and then I have to run to the bathroom. This has been going on for a week today. I am not dehydrated and it does not happen like every hour its just every time I eat anything. When we were in Punta Cona, she had an upset stomach the whole time we were there and she still does not go a day without having diarrhea. She also has a bad cough and a runny nose. I think I gave her the cough though because I had a cough for about a week and a half and then it started into my chest. My cough is gone now but this diarrhea is killing me. I do not like being at work and having to run to the bathroom especially since I work in an emergency vet so I am always needed to be running around doing things. Any ideas on what could be causing these issues? I have not tried taking anything over the counter except tonight I did just take pepto to see if that helps. :$