I was veggie for around 6 years but my heart was never really in it so when I stopped the first thing on the menu was a bacon sarnie with lashings of brown sauce! I don't recall any ill effects with regards to digestive problems either.
I was vegetarian (no meat or fish, and I was very careful about it) for 37 years until January 2014. Then I quickly became omnivorous again, with no problems at all. I am so enjoying being able to eat anything I fancy! Hope you enjoy whatever you decide to eat.