If you are feeling angry/disappointed/frustrated/lonely/unloved/nervous/exhausted/confused/misunderstood/misused etc. it is your Ego. If, on the other hand, you are happy/joyful/contented for no apparent reason at all it is your Heart, your True Self. The moment you are letting go of your Ego there are no more problems to vex you. Henceforth the former "problems" to you will just be situations which are different from what you expected them to be and therefore are calling for a different solution than the one you had initially foreseen.