Looking back, it was mostly the stress and eating like junk at night. That's not to say that I have the most stress in the world, plenty of people deal with far more and handle it better.
I think my approach now will focus on tracking and staying accountable for a month or two, since that will really help jump start my fitness. But more importantly, I will focus on how to handle stress better.
At night, I get home and basically plop on the couch and start chowing. I am so exhausted after work, despite it being mostly sitting in a cubicle, and I just have no motivation to do anything. Even going for a 20-30 minute walk is a challenge most nights.