1). Why will getting this job mean no more therapy? Most of the time we think in black and white, which means maybe even with the job there would be a possibility of therapy but you might have to work around things to find it. I see a therapist at 9:00 in the evening once per week. I have three children and a husband who works all day so I found someone who could see me after hours. A lot of time this is a possibility. Finding a good therapist, one who we can eventually somewhat trust, as much as we are capable of trusting, is a hard thing to do. Especially one who is trained in BPD. It's worth the search though. It might be a hard road but you can't currently feel as bad as you're feeling and not be in therapy.
2). Do you have two more sessions to go, or have you already had your last two sessions? If you still have a session or two to go, ask your counselor for a recommendation. Don't hold back any fear you may currently have.... lay it all on the table again so she knows exactly what scares you. She is probably extremely aware of your abandonment issues and will be able to guide you in a healthy direction. The time to communicate is NOW. Don't keep it in because you need to get this figured out as soon as possible.
3). What are the BPD behaviors that keep creeping into your head? If they are the usual "I am scared that people will leave me...I chase everyone away...What is wrong with me?...I must have done something wrong...She was the best therapist and I'll never find another as good...etc..." then it's hard to say just how long that may be a part of your daily thinking. If the thoughts are "I want to hurt myself...I need relief...I wish I didn't exist...Nothing will ever change...etc..." then I say you need to get more immediate help.
Gray thinking isn't something we're accustomed to, but sometimes stepping outside of ourselves (which is also unfamiliar at times) will provide the answers. As always, it's easier to give advice on what we should and shouldn't think, do or say than it is to live that advice. I'm afraid I'm not getting through my every day without the BP behaviors getting in the way even still, but occasionally I like to sound smarter and more in control than I really am. So, I hope some of this helped in some way.
Thanks for sharing your feelings, it's better than keeping your fears inside. Keep seeking the support you need! Good luck to you!