Hi Fiona, can I just repeat what someone has said previously and make sure you get multiple readings of your BP. From my own experience "white coat hypertension", can make a big difference to the readings - everytime I got near a doctor I got paranoid and my BP would shoot up. Eventually I got measured by a very cool doctor who put me at ease and lo and behold, my BP was normal.
As for running, if you are worried about doing too much too soon, speak to your doctor again, that's what they are there for :) He or she will probably put your mind at rest. Like most things in life, just don't too go crazy too quickly, gradually increase both your distances and times, and don't be embarassed to stop and rest (or walk) several times if you have to. I started running in April and yesterday morning I completed my first 5 mile run. It wasn't very quick at 53 minutes, but I'm very pleased with myself. I've entered into a 10k in January and my aimis to complete that in less than 60 minutes, which I think is realistically attainable without too much pushing.
As for losing weight, it's a bit strange, I eat quite healthily I think, and I am now running 3/4 times a week, but the weight is not coming off me (5'11", 16 stone), i think it might be moving a round a bit though :) I think you just have to be patient in expecting weight to go, it seems to vary a lot from person to person as far as I can see.
happy running!
dave