Either your brain is turning spongy or you're just unnaturally preoccupied with stupid shit.
These periods of complete brainlessness are starting to get scary, but it's not something that can't be countered with a little concentration and shedding of worldly concerns. Like "OMGS I can't wait to spend my paycheck on shit!" I thought we had agreed that the accumulation of crap was not something to be proud of? And here you go daydreaming about all the crap you're going to accumulate.
It's an easy trap to fall into, especially with the winter approaching and the human need to stock up taking hold of the brain. Your behaviour might even be excused as somewhat natural. But it's also scaring you pretty bad, so let's take a breather and lay off the incessant buying, allright?