Well your swing probably got off plane and now it’s all in your head. If you have one I suggest going to see your instructor and if you don’t have one I suggest getting one, and fast. It’s also hard to say what’s wrong without actually seeing your swing.
Winter happened. Happens to everybody.
you just had a lack of practice. Just hit the range and/or the course for the next few days and youll get it back if you try hard.
See a good teaching pro. Practice does not make perfect, but..Perfect practice makes perfect! Be patient, you may have picked up a bad habit or two and now are probably swinging to hard. In golf it is timing, remeber the ball just gets in the way of a good swing, hit through the ball NOT to the ball!