By the way, 11 miles in, 10 hours working, then 11 miles home WILL feel tough. It will feel tough because it IS tough.
I find I can always tough it out more easily going home. Home and hearth (and dinner!) are powerful incentives.
It will take a few of those, maybe even a few dozen of them until it feels okay. That's all part of the process.
An alternative, or maybe something to help you build up to it, is to drive your bike to work with the car. Ride the bike home that night. Ride back in the next morning, then drive the bike home.