Stopped being vegetarian, now my stomach is wonky feeling?

I was vegetarian for 8 or 9 months. And I realized that it just isn't a way I'm able to live at the moment. So I've started eating meat again. I haven't been able to eat as much and my stomach has been feeling bad. Is it bad that I just started eating meat again? I stopped a week or two ago and my stomach still hurts. When do you think it will stop and go back to normal?
Stopped being vegetarian, now my stomach is wonky feeling?
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