Lisinopril and ulcers

I have been on 5mg of lisiniprol for 6 months now and although my BP has reduced I have really bad sore pain in the lower inestine, always worse through the night followed by very loose stools the next morning. I have a slight cough but i have noticed that when i get a common cold, the sore throat symptoms go on for weeks and have turned into ulcers.
I would love to find a BP tablet that didn't upset my digestive system

August 2002 went to doctors suffering leg strain through cycling. Found in general check up to have moderately high blood pressure (age 54 male, slim, almost non meat eater, based England). Was put onto 10mg. Zestril (which is produced near to my home in England). Incredible almost instant reduction in blood pressure. Only side effect a slight dry cough, and a general 'laid back' feeling. Was subsequently re-prescribed various other makes of Lisinopril. Started to upset my stomach and made worse an existing tendancy to ulcers (for which I take Zantac 75). Went back to doctors and asked for reduced dosage - 5mg. - Zestril brand. Reduced dosage is controlling bp but I still feel a side effect is a slight feeling of apprehension or unrest, which is not helping my stomach at all.