If your diastolic is above 100 that's just too high! If you don't have one get a monitor that records, upload the results to your computer and keep track of it. It could be as simple as a low-grade infection that a ten day course of antibiotics will fix. But take plenty of readings regularly so you know exactly what the problems is - or if there is a problem.
I have a $150 Omron monitor and check it all the time, most mornings and nights - mostly just for the hell of it, because I like knowing what my body is doing. Mine went sky high six weeks or so ago (like, 140/88 or so!) and because I was monitoring it I knew it was high and I had to do something about it. (What caused it - dunno, maybe infection, in any case it went down to my normal after three or four weeks.)
Also: they are highly inaccurate - and so are doctors and nurses. So I take two, perhaps three readings each time. Left arm, right arm, left arm.