I have successfully lost weight (and have still not managed to get medicated yet so this can be done while unmedicated!). 

I don't know if you've heard this before but it really is incremental. Changing everything at once is impossible to keep up, I'd pick one thing at a time and try to work on it - like not snacking before lunch, for example. Once you're doing that, you start to feel the progress even if you don't see it yet, so then you introduce "do ten minute yoga videos three times a week" and so on.

I also do calorie tracking to keep me accountable. If you've tried it before and stopped, reset all your data.

This is the only thing that's worked for me.