What advice have you gotten from your doctor?

My doctor told me to find something that will be sustainable and something i could do for the rest of my life, definitely a lifestyle change and not a diet.

When I went to my doc because I had been doing everything right (I had gone to a registered dietician for a healthy meal plan and had been working out 6 days a week) but still in a year I had gained 37 lbs, she said she can't figure it out because all the blood tests she was doing were normal, she said that there must be going on that she hasn't tested for but she doesn't know what to look for/at so she said I needed to go to a specialist, she sent me to an endocrinologist and it turns out I'm in the early stages of hypothyroidism and insulin resistant. I've been on meds for both for about a month now and I'm feeling better and sleeping better, I don't know if I'm losing lbs yet (it may take a while for my system to adjust to working the way it's supposed to according to the endo and I won't get on a scale right now, it's another area the doc talked to me about: I was getting too obsessed with the numbers so I need to stay off until I can deal with it better) but I have noticed tiny changes in the way my clothes are starting to fit

My dr gave me weird advice about lifting heavy weights, told me to stick with 5 and 8 lb weights otherwise I'll start to look like a man. I actually worked for him for 10 years.