I Take Lisinopril For My Blood Pressure, & It Has

I take lisinopril for my blood pressure, & it has been in ceased from 10 MG a day to 20 MG a day due to increases with it. I work some crazy hours, (16 12 HRs) I'm 66, & lt will be fine when first get up, but after up an hour or so, it starts running high, esp. Bottom number. They want me to take 1-10 MG in am, 1-10 MG in pm. Is this correct what to take. I took it this am at 11 am (central) & now at 7:25 p.m bottom # 94, retook, is now 141/77. Should I go ahead & take 10 MG now, even though hasn't been but about 10 hours that took first dose?