Mitral valves symptoms and conditions

I have been in Lisinopril for about a month. I have a dry cough that keeps me awake at night, headache, fatigue and lightheadedness. My doctor refuses to believe the cough is from the Lisinopril. He said I have not taken in long enough for it to be side effects. He keeps increasing the dosage from 5mg then 10 now 30mg my blood pressure continues to climb averaging 150/100 not dropping below 140/90 and spiking to 177/118.My doctor is not concerned and says come back in 2 months. I am calling him tomorrow and if he doesn't change my med. I will stop Lisinopril and find a new doctor!!!!!!!!!!!!!!!!