No matter how much it sucks, start working out. I know it sounds absolutely counterintuitive but using that energy for a 1h workout will give you so much power back.
When I started working out I joined a boxing fitness class, it was simple. 1 hour, no prep, no need to think about gear and just follow instructions. It was exhausting but it rejuvenated me like crazy. It was like I had never charged my batteries before, because they never really drained so I had all this old, shit energy in me that was finally replenished.
The first few times are rough but you'll only gain from it, keep at it. Find something that's easy to get to, near work or home and just do it. Don't think, pack a bag tonight and try something out tomorrow.