What Could Sudden Indigestion And Severe Itching While Running Indicate?

Last night I went for a run and began experiencing indigestion into mile 1. By mile 2 it became so bad that I had to start walking. Additionally, my hands and face began itching. I went home and immediately took some pepto and acid reducer along with some benedryl for the itching, swelling, rash that had now began to show throughout my face, arms, and shoulders. I took a cook shower and sat in front of a fan. This morning, I m fine, but what caused all of that? I had eaten 2 hours before running. I ate chicken alfredo with garlic bread. No problems before I ran though...