It's a steroid shot, helps me be pain free about 6-8 weeks some people never have pain again after the shot. My last shot was 6 weeks ago and I'm hoping the relieved pain was from loosing weight. My foot dr told me every pound lost relieves 20 pounds of pressure off of your feet and knees. During my pre op diet they instructed me to due protein shakes along with tuna in a can turkey breast or chicken and I lost 16 pounds in under 7 days. You will do great just keep on your path. I'm was banded on 8/14 and today I'm just starting to feel hunger. I bought every baby food under the sun for my soft food stage hoping it will curve cravings. You are going to do great and look great!
Oh and I almost forgot and your exercise issue. I found on amazon these under the desk bicycle petals. They work great for cardio. I call it lazy person cardio.