Wow, 4 hours of working out each week in the gym is brilliant!
Are you doing mainly cardio-type workouts on the running & rowing machines? This is what you need in terms of exercise to lose weight.
Have you had your thyroid checked, and is it functioning properly? An under active thyroid can greatly affect the ability to lose weight, and medication, and sometimes surgery too can reverse this.
Cutting down on sugar and salt will help with losing weight, and switching to brown rice, bread and pasta means that you can still eat these foods in moderation. Try and fill your plate more with vegetables or salad than carbs or protein.
There are ‘diabetes diets’ that you can search for online, that have been really successful in helping people to lose weight, sometimes to the extent that they’re able to reverse the condition. Dr Michael Mosley has one that has been very successful.
The NHS website also has lots of generic weight loss trackers, apps, videos and tips that I’ve found useful in the past.
Try not to think too much of the words ‘diet’ and ‘dieting,’ but more of ‘lifestyle.’ I find that word is far more positive, and suitable for the long term.
As for weight watchers, I’m sure it must be very successful for lots of people, but 2 women who I know have been going to it every week for years and years and are still obese. I’m sceptical about it, and see the whole thing as a money making scheme, but as I say, that’s based on others, not personal experience, and everyone is different.
I wish you the best of luck