I started taking Prozac 10mg for a week and already starting to feel the benefits, I called my doctor and he told me to start on 10mg and if I felt ok then to bump up to 20mg, I took my first one yesterday and was fine all day, then my husband was talking to me and it was like my brain was in a fog and went blank, he thought I was ignoring him, is this normal and when will it pass and should I go back to my 10mg seeing as I was already feeling the benefits?