I'm in month 5 of my healing, recovery diet. I tried a zucchini (peeled, sliced and steamed...actually over-cooked

Seemed fine at first but the next morning felt terrible with diarrhea and the following night had severe belly pains!
Anyone else have this response? I thought it would be safe to eat as it is from the "squash family" and I seem to tolerate them fine.
Any input from anyone is appreciated.
Thank you,
Julie