I've only just seen this and not being a doctor can't really answer. I know that my BP went up to 220/150 while visiting my mum in her care home (she just told me that my gran was at the end of the bed waiting to take her to heaven), the care staff noticed that I wasn't quite right took my BP and I was in the local hospital's A&E very quickly.
If your BP is troubling you then go to A&E, or call NHS Direct and see what they suggest.
If you're worried about your kidneys (GFR/Creatinine tests) the best person to talk to is a doctor.
A lot of GP practices are open tomorrow, I hope yours are. Could be NHS Direct is your best first step.Hope you sort it out.