Your in a place more people than not find themselves in. You have a lot of things that you know you need to change, But no one can do all the things at once.. You gave up Soda ? Hell that is Huge !!

You need to just start with obtainable goals... Take a X amount of minutes walk a day. Or when that craving for X food hits, find something else to do for 20 mins , as that is usually the amount of time it takes for a craving to go away.
If I notice I am spending too much time sitting on my couch, I make myself stand up and watch tv... Yep its annoying lol but its a good mental tap to help you find something else to do.

Making any changes however small will make difference.

Even if you hate your meds, take them as prescribed for now , until your getting yourself into a daily routine and feeling better .. then you can talk to your doctor about your medications and maybe change or stop a few when its a healthy time to do so .

Good luck, One step at a time.