I wouldn't be suprised if it was not the red meat per se but rather hormones or chemicals used to grow the animal and preserve the meat. Have you tried different sources of red meat I.e supermarket, butcher, restaurant, out of town? It is hideous what they do to food generally so they can produce and distribute on an industrial scale. I would not suprised if today's processed foods are a greater cause for things like obesity and cancer than the authorities and industry would like to admit.
If you do try to eat red meat again, and I hope you do, try and switch that part of your brain off that otherwise may lead to a self fulfilling prophecy.