What have I done?

It was an odd Friday.
I was summoned to the Midlands by one of the companies I do a bit of work for. I started working for them at the beginning of the year after a sudden downturn in paying gigs being offered. The company had actually been pursuing me during the summer, but I didn't fancy it, despite the immortal line from the desperate middle manager doing the pursuing that it was "money for old rope".
How can you refuse an offer like that? Well, I did for a bit. But a worryingly quiet December had me beating a path to their door with my tail between my legs begging for work, which was still available. Phew!
It hasn't all been plain sailing though. The work isn't that interesting and there have been issues with the project - namely how long-term it was likely to be (my feeling is that it's going to be pulled at some point).
So anyway, I approached the meeting with a certain degree of ambivalence. I knew that there were a few changes in the offing as one of the main people in the team was leaving. So I ended up in a meeting where the manager was effectively saying could I take on more responsibility.
Before I knew what I was saying I'd effectively talked myself out of a job, saying that I wasn't currently able to take on more work from them (true), that I didn't really agree with that they were trying to do and presenting a withering critique of their corporate culture, which I think is too navel gazing.
The lady I was meeting with actually seemed a bit stunned, although she thanked me for my candour. It now seems that they will look for somebody else to take on the work, and I'll be let go.
As I headed home on the train I was reading ever more gloomy economic predictions for the next few years which brought on a sense of panic. Suddenly I was mentally pulling the emergency stop cord and running back up the line to let them know it was all a terrible mistake. This feeling has stayed with me for most of the weekend, despite my wife pointing out that I've got more work than I can handle at the moment, that I didn't want to do it in the first place, and that I'm always moaning about it.
I guess such periods of self doubt are the curse of the freelancer. The old saying is that it is either famine or feast, and there seems to have been more of the former than the latter of late. Will I live to regret this decision? Time will tell.