It's definitely depression but I can assure you it will pass. Your self esteem will snowball as you take control of your life and lose the weight. It actually happens pretty quickly and exercise (endorphins) makes it an even quicker process if you are so inclined right now.
The last thing I wanted to do when I was in that place was exercise but it was what I needed in a very severe way and when I finally started - only walking 20-30 min a day, everything changed for the better.
MAKE yourself get out of the house.. just do it. Just decide now that you will and get a walking outfit together now and get out first thing in the AM before you do anything else.

If you have to, set the alarm 30 minutes earlier.
I guarantee that in 3-4 days you will feel yourself coming out of your funk. I guarantee it.

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