I don't want to scare you ....
But that chain of events was what happened during my last winter as a lardass. In February 2008 I was at 250. I got the flu, which caused an ear infection which was treated with antibiotics which killed my flora and cause six weeks of chronic diarrhea. SIX WEEKS. During that spell, I went to London for 10 days. I was able to finagle a seat right next to the men's room
I was still in distress when I returned AND I developed a cold and an infected tooth which required a root canal. And you guessed it, more antibiotics.
By the time I was better, I had only dropped about 10 pounds. And that was when, on 19 April 2008, She(WMBO) put a foot in my butt and told me "Get up, Get dressed, we're going to Weight Watchers."
The moral of the tale: take care of yourself, don't push too hard, get better, get well. Give you body the time and rest it needs to fight off the anti-infection (best word I can come up with) that is causing the gastric distress.
Even at its worst it's only a few weeks out of your life. Take a break. As long as you are champing at the bit to go, you really haven't fallen out of training.
Start by doing what is necessary, then do what is possible and suddenly you will be doing the impossible -- St Francis of Assisi
Rock 'n' Roll Dublin Half Marathon, Dublin, Ireland, 8/5/2013 ie.competitor.com/dublin/