Abruptly stopping venlafaxine (Efexor), which is an antidepressant, can lead to withdrawal symptoms due to changes in brain chemistry. The symptoms you experienced, such as dizziness, chills, and other things, are consistent with withdrawal effects.
Regarding the euphoric hypomania, it's important to understand that bipolar disorder is characterized by episodes of depression and episodes of mania or hypomania. Hypomania is a milder form of mania, during which a person may experience elevated mood, increased energy, impulsivity, and euphoria. However, it's worth noting that venlafaxine is an antidepressant, and its sudden discontinuation can sometimes trigger mood swings, including hypomanic or manic symptoms, especially in individuals with bipolar disorder.
Stopping psychiatric medications without proper guidance from a healthcare professional can be risky, particularly when dealing with medications like venlafaxine, which may require gradual tapering to avoid withdrawal effects and potential mood destabilization.
If you are struggling with medication management or experiencing any concerning symptoms, it's crucial to seek advice from a qualified healthcare professional. They can assess your specific situation, provide appropriate recommendations, and help you navigate the complexities of managing bipolar disorder and borderline personality disorder effectively. Never hesitate to reach out for professional help when dealing with mental health concerns and medication adjustments.