Yes, that is so true. Every new thing that you put into your body is an experience and an experiment. And, everyone is different. What one person can tolerate, another may not, even if it has been proven to help with most. Don't feel like you did anything "wrong", especially if you gave it a fair trial.
Hang in there, and you will find what works for you. It may be trial and error for awhile. Keep the faith!