Going back to normal food for me after my 13 day Master-Cleanse was very unpleasant. I would eat anything and I felt sick afterwards, even after breaking it with 2 days of OJ and I did a couple days on soup just because I made so much of it (and it was sooooo good!). I wanted to make sure I restored my healthy intestinal flora so I started drinking kefir daily. I started breaking out with these large painful boils on my back which I think was a result of the dairy. I couldn't believe it, I drank milk everyday of my life and when I got off the Master-Cleanse all of a sudden I was lactose intolerant.
All people are allergic to dairy products, only in our first few years do we make the enzyme lactase to break down milk sugar. After drinking it for so long of course, our bodies get used to it and it starts to cause all kinds of problems.
I also experienced some heartburn for the first time in my life after the Master-Cleanse and it made me so angry. I can't say exactly what caused it but I was just careful of what I ate and it stopped.
It's been a few weeks from when I ended my first MC, and I just started a mini one 2 days ago. It really feels like a relief from eating all the time. (My taste for food is greater than ever)
If you're still experiencing problems, I would recommend you take some supplemental digestive enzymes with certain foods. Any supplements should ONLY be derived from 100% WHOLE FOODS. Or you can just eat foods that have all the ready available enzymes to break them down (raw fruits and veggies), or eat foods like papaya and pineapple if you eat cooked foods or unhealthy foods (chocolate, dairy, etc.).
It's not easy, but listening to your body will tell you more than any doctor. Hopefully, they will help you in a safe and healthy way.