too much pressure

In my pursuit of a provisional HGV license, I had to have a medical. I ticked all the boxes, except for one. My blood pressure is excessively high, dangerous even! A visit to my doctor confirmed severe hypertension that would need to be treated immediately. I am now taking a drug called Amlodipine, this should stabilise and lower my blood pressure. The cause? Being overweight, not exercising enough, working long hours at night and eating the wrong things. I need to find ways to improve all of the above. Failure to do so might prove fatal.