25 drops of h2o2 in a glass of water, but how big is the glass? The maximum safe concentration for oral use is 0.5%. I tried h2o2 starting with a very low dose, 3 drops in half pint of water and built up by 3 drops a day until I was on 36 drops a day. This is about 0.35%.
You say that you stopped taking h2o2 because you got sick, and that you rarely got sick before, so why did you try h2o2 in the first place?