<<Disclaimer: Verify this information before applying it to your situation.>> I have been doing a gluten challenge for 8 weeks now ( I was never biopsied). I thought I had been doing well until this last week and a half. I am not sure it is a gluten reaction or not - I will see my gastro on Wednesday. If you or someone you know did a gluten challenge (I was GF for 7 months) - how long did it take til you started feeling miserable and what is 'feelign miserable' to you? Thanks. Sally