Thank you for your detailed letter. From what I can tell, you need to be in treatment with either a doctor or a therapist. Bipolar disorder is a disorder that needs to be managed and closely monitored by one if not both of the aforementioned mental health professionals. If you do not want to take medications then try seeing a therapist.
It seems as though you have never really had any positive role models or much support from your family. You were probably left on your own to fend for yourself emotionally having no one around to help you learn how to balance your behavior, thoughts, feelings and emotions. It would help explain why now you are so disregulated and have problems overindulging in such activities as gambling, and so forth.
It is more complicated than this of course but it did not help that your family life was remarkably unstable. Your family still does not support you today as evidenced by how they reacted to you taking medication and finally getting help for yourself. You need to garner support from people who are not your family since they do not seem to support the idea of you getting help for your bipolar disorder. My advice is to find a therapist who you feel comfortable meeting with. I would also suggest going back to the doctor and consider taking medication as this will help you at least regulate your mood. But if you are not interested in medication I can well understand this but would still strongly recommend that you consider therapy. It would be unwise for you to continue trying to manage this illness by yourself. I hope this helps.