Why is my blood pressure getting so much higher upon standing?

Years ago, I used to have orthostatic hypotension. Lately, my pulse still rises 15-25 bpm upon standing (after waiting 2-3 minutes), but my blood pressure also rises about 10 systolic and 15-20 diastolic upon standing. I still sometimes get lightheadedness/tunnel vision upon standing, but I figured my blood pressure would be dropping but it isn't ! I am very well hydrated and am otherwise healthy. Btw my blood pressure while sitting is usually 90s-100s over 60s.