do you have a trauma background? and the reason you are so bored all the time is because you have disconnected so you don't have to feel anything? then the intense feelings come on because they have triggered something related to the trauma memories and you are reexpriencing all those feelings from the past for a brief intense moment and then you disconnect again? just an idea.....I just read a book called waking the tiger and it was talking about when people have mental health issues that don't make sense it is usually trauma related.