I've been thinking about this. It's really like an addiction with me.
Once I've been flying, I feel just fine. In fact, I think it's the feeling after flying that I really really like; having flown is in some ways even better than flying. And then, although I'm always happy to fly, I'm fine...for a week, maybe two. Then I start getting restless. Especially on sunny days. I start watching the weather forecast, finding reasons why I really really need to fly to keep current.
Whirls
When I read what you had said it was so close to me that it felt like I was reading something I had written myself. The only difference with me is that once I go past a month the feeling becomes more one of resignation and that of "having to accept things" as opposed to looking for the slightest opportunety to go up. My friends at work must be sick of me looking out of the window and moaning that I want to be in the sky.
Not long ago I had a pig of a journey back from Menorca. I did wonder what had happened to my sensible side when we (I) decided that we would go there in KT. However within an hour or so of landing I was thinking about my next trip, the next day I spent a few hours planning it (an IFR trip up to East Midlands). Sadly I have not been up since because of the engine work that is being done at present.
Fujiflyer