A TAD and a gut problem

BIKE 75 mins and 22 miles, 2x27 mins 75%
RUN 55 mins and 6.1 miles, commute to work

The bike...indoors...what more is there to say about it.
The run...outdoors...WONDERFUL! I was supposed to do 4x1 mile at the track but thought better of it. I'm tapering! And my legs are still feeling Sunday's 20-miler.

I was able to wear shorts on the run! I looped through TGP and enjoyed the "rain" of petals from flowering trees, the sweet smell of the flowers, and lovely cool weather!

But that's all in the morning, the afternoon went different. I ate my usual preWO at 5am, had some midWO foods at 8am, then had brekkie after the run at 930am. By 2pm my stomach was upset. Lotsa pain from rib to hip, radiating through my back, down into my legs. I can't tell if I'm bloated or if I'm just suddenly aware of my pants and belt touching me. I pushed through some infections then went to the shower room to lay down. In 15 mins, gone. Mostly gone anyway. I was tired the rest of the afternoon, waiting to see what else might happen. I had some gas, but it was hours later. Was that it? Why the largely diffuse pain all through my gut? Why does it come on so fast? Why does it go away when I lay down?

This isn't the first time for this. I had it last Tuesday too. Did I eat too soon after the run? Wrong foods? Too fast? Gotta figure this out!