wow, are you seeing a super-elite therapist who caters to the super-rich? The only time I have seen fees that high are in NYC and LA/Hollywood where the T's see super-stars and the very wealthy. Most T's in my area cap-out at about $250-$300 (for an experienced, extensively-trained PhD or PsyD with years of licensed practice under their belt, or for a PDoc that also does therapy)...
I hope your T is willing to discuss the matter with you, and figure out what to do from here on out.
That must have been a shocker of a bill.