Dude I know exactly how you feel. I felt something similar, although to a lesser degree, when I set up Daygame.com.
I was spending ALL my time infront of my laptop working on the site, and less time out there doing my thing, and I started to notice some approach anxiety creep in when I was out and about. I also noticed that I wasn't as "quick" and "on the ball" in set as I had been before starting the site.... which you can imagine as a Daygame instructor (I was working for PUATraining at the time) is incredibly frustrating.
I spoke to my mate Tom (the guy who taught Adam Lyons - on podcast #6 and #20) and he put my mind at rest. He told me it is impossible to maintain a high level of skill with ANYTHING if you don't keep practicing - but that's ok, and to be expected.
He told me we all have priorities in our lives, and other projects and goals we have to pursue. When i first started Daygame.com I HAD to dedicate all my time to it, otherwise it would never have gotten off the ground. Since then I started going out regularly again and I got my game back to, and better than where it was before.... but I NEEDED to go through that downtime.
It's the same with you mate.
Just don't look at things negatively: Your new job didn't "take away your Saturdays", it GAVE YOU some much needed regular money (which I'm guessing you needed or you wouldn't have taken the job). Just as my dedication to working on daygame.com didn't TAKE AWAY MY ENTIRE LIFE (it felt like it at the time!), but allowed me to create something pretty cool (I think!).
And as for the winter meaning you aren't going out and daygaming as much, I will tell you a philosophy that I live by that is relevant here:
"If there's something you can do about it, then decide what needs to be done and take action. Any time you spend worrying/stressing about something that is outside of your control is completely wasted."
The weather and the seasons falls under this. If you get frustrated whenever it's stormy or cold, then you're in for a rollercoaster ride of emotions my friend, cause it happens every year!
If you're ever feeling frustrated, it's usually caused by "wishing the present to be anything other than what it is right now". The bigger the difference, i.e, the more displeased you are with the present moment, the greater the frustration.
But again, if there's nothing you can do about it - relax. Why feel frustrated over something that you CAN'T change? If there IS something that can be done to move towards a future that is more inline with how you would like the present to be, then decide what needs to be done, and take ACTION to that end. And then relax again. If you know you are moving towards a goal and you have done everything that can be done, then again, things are now outside your control. So grab a beer, and relax. Enjoy the journey.
Hope that helps!