I don't have the book to remember - but don't you only need like 4 or 5 of the 9 criteria to get the BPD diagnosis? I know I don't meet ALL the criteria, but I meet most of them.

Therapy, especially DBT, will be more crucial than medication if it is truly BPD. But you may want to ask about Lamictal. It's being studied to be FDA approved for treatment of BPD. It just went generic (in the US..not sure about UK). Anyway, just a thought.

Good luck!