I have overwhelming anxiety that comes and goes. it has really affected my relationships. do i have borderline personality disorder.

Anxiety & BPD: Yes, anxiety can be intense with borderline pd -- but it's not clear from what you wrote that you have it. People with bpd often experience extreme sensitivity to rejection & fears of abandonment. This can trigger angry outbursts and conflict in relationships. Long-term psychotherapy along with dialectical behavioral therapy (dbt) can help greatly. Start w/basic assessment first, though.

Need more info: This in and of itself is not enough to diagnose bpd. If this is the only sx, i would look at other diagnoses first.