I m 20 years old, and was diagnosed with essential hypertension approx. a year and a half ago. I was started on Lisinopril and then a diuretic (HCTZ) was added. Until 2 weeks ago I was taking Lisinopril HCTZ 20-12.5 MG (combined in one tablet) and felt fine pretty much. But, my dosage was increased to 20-25 MG. Ever since my head feels foggy, I m unusually tired, resting HR is slower and overall just out of it and don t feel like myself. Was wondering if it s possible that my potassium is high. Any answer is much appreciated, thanks in advanced.