What Causes Headaches While Taking Medication To Reduce Cholesterol Levels?

Hello! I have a question. I got some lab work done and my cholesterol came out really high in high 300 s. I am currently taking medication for that and they also put me on lisinopril because my blood pressure was also high. In one month I brought down my cholesterol to 250 but the doctor told she was going to give me one more month of pills to help me bring down more the cholesterol and my bp. My concern is that my blood pressure is been great but its been 3 weeks that I been getting headaches mainly everyday most of the day and I have pressure on my left side by my ear and I check my BP and its good. Can it be because I have TMY?