I have been on Lisinopril for several months and my blood pressur...

Difficulty in breathing is also one of the side effect caused by Lisinopril. You can look at the list of side effects and various drugs that interact with Lisinopril to increase the intensity of side effects. See if you are taking any of these medications.
http://www.internationaldrugmart.com/lisinopril.html

Did you have asthma before taking Lisinopril? No? It's the Lisinopril. The cough, lightheadedness and fatigue are side effects of Lisinopril. Don't take more meds to fix the side effects - it just gets worse! Visit drugs.com for a comprehensive evaluation of Lisinopril. You can also check for drug interactions. Good Luck.