I read through some of your recent blogs too and I suspect that some of your depression may also be related to the problems you've been having with your foot. Because you can't get in your daily walk without pain, that's left you housebound. Being stuck in the house in pain would cause anyone to become depressed.
I know that crocheting doesn't get the house cleaned as you mentioned in your blog. BUT, crocheting does help lift your spirits. And that's exactly what you need right, something to lift your spirits while your foot heals.
Don't beat yourself up because you can't always walk every day. I give all new members one piece of advice and it's this,"Don't look at good health or weight loss with an all or nothing mentality". If the only healthy thing you did for yourself today was drink 8 glasses of water, that's still a step in the right direction.
If you can't do any lower power exercises because of your foot, then do some upper body exercises inside. Coach Nicole even has a couple of workouts you can do while sitting in a chair. www.sparkpeople.com/resource/videos-detail
There are other chair workouts listed that you could try. So, even though you might not be able to walk, you can still get in some regular exercise. This may not seem like a lot, but it really IS something you can do to remain active while your foot heals.
And I definitely I'm going to encourage you to continue crocheting. I'm a firm believer that stress is a neglected aspect of weight gain. If a person could reduce their stress they'd automatically reduce their waistline. Doing something you enjoy is a way to reduce your stress and maybe it'll help reduce some of your depression too.