Last bit of excuse gone...

I have no tips for weight loss, I need to loose weight myself, but I do know that Vitamin D can be gained by spending time outside. 15 minutes a few times a day will help that out a bunch. You could even do your walking during these times.

But be careful to not spend to much time in the sun without sunscreen.

Did the doctor have any bright ideas on how to get the weight off? Since I started on the DepoProvera shot I have gained weight and can't seem to get it off. I am willing to try just about anything at this point.
Currently, I am trying to cut down on the carbs, I like pasta and potatoes way too much. I am also planning on switching back to the pill next month, it seems like all the weight was put on after starting the shot. Also, I don't like how I feel on the shot.
I read an article somewhere about Vit D being helpful to lose weight. I hope it is true and when yours is corrected, you can see the difference.

Good for you for taking iniative and getting that bloodwork done. I actually had the same situation, sort of - I always chocked my weight & fatigue on having hypothyroidism - something A LOT of my relatives & ancestors do (I assumed that I had inherited it - because I felt like I had some of the same symptoms as them) - but after I got blood work done, and nothing was wrong with it - I realized it was just me, and I think it was just my mentality over all - was making me feel sluggish. I started working out & getting more active & better about what I was eating..And magically, a lot of the crappy symptoms I was facing have disappeared - like constant head aches and fatigue.

Good luck, though! I'm sure with the right amount of effort & dedication, you'll become healthy && accomplish whatever your goals are!