You will probably need a fine-tuned medication regiment that stabilizes you without flattening you out. Plus, "social rhythm therapy for bipolar". Plus, something to stabilize you outside of psychoparmacology: journalling, exercise, being out in the sun for short periods of time, these things. But most importantly, patience with yourself as you won't revert back to the witty self in an instant - it will be a process that may be drawn-out.