I have felt the same way, holidays and weekends were awful. For years I worked as many hours as possible. I was an ideal employee, always happy to do overtime, in early and leave late. For me it was a way to keep feelings and thoughts at bay, I felt like a hamster in a wheel, running fast and getting nowhere. When I stopped I felt empty and depressed. Looking back I think it was a better way to cope than some I could have chosen.
It started to change for me with therapy etc, I found it easier to face the things I was running from and now I feel like I donít have enough free time.
The gym sounds like a good idea, exercise gives me a lift when I need it.