Bipolar is a nasty illness both for the sufferer and carer - as you already know not only do they experience extreme highs - that can lead to mania but also lows that can lead to depression. There are also mixed states where you can be manic and low at the same time. The most important thing is to not blame yourself or feel rejected - these mood swings are chemical in nature and are nothing to do with you. I would get a second opinion on his treatment because it sounds like he needs to be stabilized - it can in some cases take time and experimental drug use but it is your best alternative. His 'N' stage is probably during his highs and they do sometimes exist together. I think first and foremost he needs to be stabilized. I do feel for you and I know that at times he will be suffering to - this isn't the true nature of his personality it is a genetic mental illness wishing you every luck and love xXx