I took Lisinopril for approx 6 years before realising (mostly thanks to this site) that many or most of the complaints I had were probably side-effects of this medication. It has been 5 months now and most of the side-effects are either much reduced or gone, but some are still there in reduced form. My guess is it depends how long one has been on the Lisinopril, and that the longer that is, the longer it will take to get back to normal (if one ever does), but I have no scientific evidence on which to base that assertion.
I was on Lisinopril for several months after having a stroke in January. My side effects were not immediate, but eventually the cough and diarrhea took over. My doctor switched me to Diovan, which I began right away. I feel much better. The only side effect is constipation...but that's much easier to remedy than the horrendous diarrhea.