OP we're the same height and I'm 2 stone l heavier than you. I'm pre diabetic and on medication.
4 years out of my lifelong marriage I've finally got my head and my heart in a good place and I'm well on my way to tackling my problem. I'm doing it under the supervision of my son in law who's a Dr and a super fit crossfitter, he has a special interest in preventative medicine and says to patients I can give you medicine or I can suggest life style changes that will have the same outcome - it's up to you to decide. More and more of them do the lifestyle changes.
So the goals for me are to lose 25 kilos by April 2018 when I'll be 60, to get off my medication by reversing my pre-diabetes, and to enter a Spartan race at the end of the year even if I don't complete the course - though I'm told I will.
How am I doing it?
Ok, so I'm eating according to a pre-diabetic/fat tummy eating plan. I'll post a link to it once I'm home. I'm doing dry January even though I only drink about 10 units of alcohol over a week. I'm not eating after 7 so that by the time I've had breakfast I will have fasted 12 hours. And that really is a big thing for me to try and do because since being on my own after 36 years of marriage I filled my nights with treats in front of the tv and my last meal of the day would be a huge bowl of cornflakes about midnight. My son in law is a big believer in the fasting aspect of things for people trying to turn their health around and I've woken up feeling great these few days.
I'm also excercising and I've left my usual gym where I had my personal training because to be honest, although great, it was kind of pretty. I was never told what I was going to do, or had things set out in a matter of fact way - it was always ok let's see how we get on today. Anyway, I now go to the same crossfit box my son in law and daughter go to and I do personal training with the head coach there. It is not pretty. In fact it's very basic and tatty, it probably resembles those boxing clubs you see on films from years and years ago. The equipment is functional and basic - think of huge tyres from articulated lorries instead of very fancy made especially for gym type tyres to throw around. I love it. It's raw. I'm never told we are going to give this a try and see if you can do it. I'm told this is what you're going to do - and I do it. In fact I can't get over what I'm able to do - yesterday one of my achievements was 60 squats over 12 minutes holding a 15 kg weight. I did sets of 5, had a short rest, then started again. I'm 59 in 3 months and I can't believe I could do that because in my other gym I would just have done squats to nice music. Here I have someone telling me I'm a machine and the music is absolutely bloody bonkers. 
. I've had 6 sessions, I go 3 times a week but that will soon go up to 4 times per week, and I feel a huge difference in myself already. Oh and I wasn't asked how much do you want to try and perhaps lose this month - I was told ok, your target weight loss this month is 5 kilos.
Has it been easy? The food has. The excercise however is a challenge, especially when I've wanted to be sick, but my son in law has explained all of that to me now and I'm not scared of it anymore.
I'm sorry if I've gone on and on but if you want a bit of company while you're making this change to your life I'd be happy to keep company with you.
Oh and 8 years ago I had a gastric band fitted. It only stopped me getting heavier. And whilst I did lost 2 stone initially I stopped going for fills and the weight slowly went back on. Mind you my Dr told me I would have been better with the bypass as it suited my eating habits better, I was quantity not quality, but I went for the band instead. As heavy as I was - I could have never done the bypass and I'm glad now, even glad about my failed attempt at banding, because I've got my head and my heart around it all now and I think I have the best chance yet of doing what I have to do.