What Causes Severe Headache With Frequent Urination?

hello, I've been having high blood pressure simptoms, slight headache, going to the bathrom to urinate allot without drinking water. then I went to test my blood pressure at walmart on the machine they have and it went the first time 157 over 95 then I did it one more time and it was 145 over 85 then I did it one more time and it came out 117 over 90. then I went to get some stuff and after paying I went to check it out again and it was some what the same results. I'm scheduled to see a chardiologist next tuesday but is it normal or do I potentially have blood pressure problems?