I can understand your frustration about suffering from chronic depression, as well as your concerns of uncertainty about your diagnosis. Depression and Borderline Personality Disorder (BPD) have some similarities, as well as differences. It is not uncommon for both disorders to go hand in hand. These disorders have been discussed on numerous occasions in our forum, and you may find it helpful to search through our archives for more information. I am glad that you felt better after your recent treatment with ECT. It is not uncommon for depression to respond better to antidepressant medications and psychotherapy after ECT. Alcohol abuse is often co-morbid with depression and BPD. It is important to address issues of alcohol abuse with your treating clinicians, whom I will urge you to discuss your concerns further with.
My therapist said that depression is like the well-traveled path in my life. It is clear and familiar, and I tend to travel toward it first, like on automatic pilot. Creating the pathway toward peace and happiness will take practice and conscious effort. It is not as comfortable for me as the depressive pathway, and I am in the process of clearing it.
It's hard work at times, but seeing a therapist has really helped me deal with the **** that life throws at us and learn that depression, though it's usually my first response, is not necessarily the accurate one.
In addition, my therapist (a PhD in Psychology) and my psychiatrist (an MD in Psychiatry) consult one another regarding my medications and treatment, which helps ensure consistent care.
I'm sorry you are having such a hard time. I hope that you can find some relief.