you're about to die... and you need to read that a few times. If that BP measurement is accurate then you are about to die.
1) Go buy an expensive and good BP monitor, I use an Omron M6 (prices have doubled as per normal greedy SA) but please don't buy a R200 BP monitor.
2) Do multiple readings throughout the day.
3) If it is still very high then you need to go on a statin right away.
4) Now you need to change your diet immediately. No more alcohol and junk food etc. Just try it for 1 month... you can do this. Then add a lot of garlic into your diet, crush it then wait 15min and drink it down, a lot of it.
5) No smoking.
6) No more doom and gloom, don't even watch the news or read anything that will stress you out, you need to calm your mind, just chill in the garden, play with the dogs and relax. Stressing is a killer.
7) If you don't do the above today, you'll be dead tomorrow.