Oh Giggy, I think most all of us have been where you are. I know I have.
Rockieplace is right, you need to create a safe space for yourself to regroup. The question is how to do so without making things worse and without feeling guilty.
The answer is with our boundaries. We create boundaries to reflect our core values... .it's like a fence of protection around us that lets other people know what we will accept or not and how to treat us. Have you ever heard the phrase "we teach people how to treat us"? With our set boundaries comes the responsibility of defending them.
Sadly, if we have never set boundaries with our kids who suffer with BPD, their reactions to them may escalate. This is why we must:
Carefully and thoughtfully consider what our core values are
Formulate our boundaries based on those values
Be totally committed to protecting our boundaries
Gently, firmly, and in advance set our boundaries with others
In this situation (and like most all of us) a boundary regarding verbal abuse is needed.
In regards to the repetitive nature of your son texting and calling ... .this is a limits issue. You can set limits regarding how many times in a day you will respond to his texts or phone calls. The tone of the texts/calls is irrelevant to the limit of what is acceptable to you. Do you mind if he texts you 25 times in a row if they are benign or pleasant messages? Or is it the frequency that is the problem?
If the content of the messages is troubling then that would fall into the boundaries issue.
Here is some info to get you started working on determining your boundaries and limits:
Communicate Boundaries & Limits, there is a link to follow at the bottom of the page that will take you to more in-depth information.
lbj