I have been on 20 mg of Lisinopril for 4 days, in supplement of ...

I have been on 20 mg of Lisinopril for 4 days, in supplement of taking Atenolol. I have experienced some dull headache pain, and some kind of ear pressure, like I'm underwater. I am monitoring my pressure myself, and it seems to be taking effect, although I don't feel quite like myself. My body is still adjusting to this medication, afterall, it hasn't even been a week. Is the benefit of lowering my BP worth the risk? Has anyone had a significant difference in their BP, as a result of this drug?