Unexpected bouts of GAS can actually be a good thing. Impulsive and/or sudden acquisition of gear can be a symptom, at least for me, that I need to branch out or broaden my musical horizons a little bit.
It's kind of like that old stereotype (that's entirely based in reality, I might add) about pregnant women suddenly finding themselves craving weird foods or somewhat unorthodox combinations of "normal" foods (anchovies and ice cream, for example). There is significant precedent that suggests that pregnant women "crave" these things because those foods or combinations thereof contain nutrients or other ingredients that their bodies need in order to remain healthy and sane during their pregnancy. It's like their bodies know what they need, and subconsciously communicate that information to the brain, creating, in effect, "FAS" or food acquisition syndrome.
So, when I find myself GAS-ing really bad, I often find that it's my mind's way of telling me, in a roundabout way, that I need to mix things up a bit; whether that's by getting a new pedal, trying a new style of music, screwing around with alternate tunings, or whatever. As often as not, I can get past the GAS attack by simply trying something new and unusual with my existing rig. None of this is to say that it always works, mind you, so I still find myself acquiring at least a few new pedals or other pieces of gear every several months; sometimes, to the point of overkill. Thank god for GC's fairly liberal return policy.
To continue the pregnancy metaphor a little bit more, and not to be too obtuse about there's a common expression that states that pregnant women are "eating for two". What they often forget is that the other person they're eating for is NOT Orson Welles.
Take that however you will as it pertains to the subject.