You are doing the right thing. I think to go straight onto medication at your age without trying to bring down your pressure by other means would be a mistake. Also, even though your BP is high - the difference between home and clinic measurements seems to be significant, that is you have a degree of 'white coat' hypertension (your BP goes up in the doctors clinic).
I would suggest firstly that you get a better monitor - wrist monitors are a bit more susceptible to variability and can give innacurate results. Get one that cuffs around your upper arm.
Definitely losing weight will help. Look up the DASH eating plan (www.nhlbi.nih.gov) which gives good advice on BP friendly diet. There are many ways to reduce BP without drugs - most give a small but definite effect, so by adopting a combination of measures you can succeed. You could also visit control-high-blood-pressure.com to read up more.
Please note that whatever you decide to do, keep your physician informed at all times.
Good luck.
The higher than the usual systolic pressure at the doctor's visit may cause some anxiety and explain the systole goes up to 160 to 200. You can continue to exercise, proper diet, etc. and that may help, however, sometimes high BP is ideopathic meaing the cause is unknown, ans sometimes it is secondary to another medical condition.
You may want to take that into consideration when trying to lower your blood pressure without medication. Your doctor may want you to take the medication to avoid any unnecessary risk. I think it is a good idea to try to avoid medication and lower BP the natural way, if possible.
Thanks for sharing and I wish you well going forward. Take care,
Ken