I'VE BEEN TAKING LISINOPRIL FOR 6YRS.NOW IT SEEMS TOME GIVING ME SOME SIDE EFFECTS,LIKE GUM BLEEDING SOMETIMES,FEELING TIRED,FEELING ALWAYS DEHYDRATED,GETTING LOW BLOOD PRESSURE ,GASPING OR CATCHING MY BREATH,IS THIS MEANS THAT I NEES TO CHANGE(BRAND OF MY MEDICINE?I'M TAKING 20 MG. THANK YOU