Is this "really it" this time

Back in March of this year I made a decision to take off some much needed weight. My motivation was a knee replacement surgery followed by a recommendation from my doctor. I was out of work for 12 weeks. The first 6 weeks of recovery required a lot of physical therapy and I also changed my food consumption quite a bit. I managed to lose 19 pounds. While entering my next 6 weeks of recovery my PT stopped because of such great improvements in healing and mobility. I was told to continue my exercises and walking on my own. I stopped the exercises but continued my every other day outside walks of about 2 miles. Unfortunately I returned to my bad eating habits and managed to gain all my weight back in the 6 weeks plus. I was so disappointed in myself for giving up quickly. So now I've joined MFP 11 days ago with my wife and we are working together planning healthier meals and trying to stay within our calorie goals. Exercise is on the agenda as well. Which of course goes hand in hand with maintaining a healthy weight and life style. My wife has joined a gym and is doing well. I haven't joined yet. I have mixed feelings about fitness facilities. I just have to get motivated and do something! In my mind I feel like this is "really it" this time and I'm going to do this. But I know I'm going to have struggles just like the majority of us do. MFP is a great tool for inspiration and accountability. It really makes a difference when you have support in that way. So, thank you MFP and everybody! Your willingness to share your stories and everyday ups and downs makes a big difference in helping others such as myself.
All the best! jpjc