I've been taking Lisinopril for about 3 weeks in evening w/food. Feel fine until following day? after breakfast or midway through it. Start feeling dizzy, light-headed as if coming down with flu. Actually start losing appetite in midst of meal. Getting difficult to go to work because of this. Ate breakfast at 8:00 this am almost noon still feel bad. Day off came home & slept 2 hrs. Still feel like death warmed over.