hi..thanks for writing..
symptoms you have described are very interesting and also found in the bipolar
depression..bipolar depression has alternate episodes of depression and
hypomania..here what you have described is rapidly changing mood and fluctuation within days and week even..
you have insight in your problems is very good sign..it can be bipolar depression..but here i would say that it can be your personality problem..
similar mood fluctuations, opposite feeling for the same thing at same or different time can be a part of
borderline personality disorder, i am not saying you have this but you shud read about it..and you feel that it can be like this, you shud go to
psychiatrist and ask for detail evaluation and diagnosis..
if it is not severe and symptoms are mild then it can be named as personality traits..
symptoms must be present from he childhood or adolescence before 18 years..
if these symptoms are bothering you so much, you shud undergo evaluation, there are drugs that can help you..i cant suggest drugs before the confirm diagnosis..
i hope this advice will be helpful to you..best of luck..