In my opinion (no offense intended)I also think you could be having some mania. We are all unique in how our experience plays out...but I can be very angry/anxious/outbursts right before I bottom into depression...I don't get true mania,more like hypomanic. For me,whn that way-I can be very chatty,spend a lot on junk I don't need,want to eat out all the time,etc. Driving the 100 miles on a whim with no money-could be mania-IMO...even though you are on mood stabilizer-mayb they need to tweak it/along with anxiety med/in my opinion...what helps me is to journal-write it all down thoughts/feelings/behaviors..I'm hoping you have therapist you can talk to'mine helps me figure out triggers that might have set my off.
Sorry I'm rambling...hoping you can work it out