I totally get it. Im sick of it too. I've been on a high the past 3 days and its giving me a headache. I had to take a diazapam Monday because it was so bad I started hitting myself. I haven't done that in years.
I'm not BPD, I'm bipolar, so I don't exactly know what its like to live with this condition, however, me and almost everyone else who has mental health problems experiences this common pain of constantly being tired of the struggle with your own mind.
However, you have to just accept that this thing is a part of you as much as your arm or leg is, as unpleasant it may be. We all have our demons and we have to learn how to deal with them. The sooner you do this the better for you. All I can say is that with the right help and with determination I am sure that you will beat this thing. And when you do, you will be a stronger person for it