Happiness as Energy

Do you think true happiness really exists? Perhaps there are only degrees, like with absolute zero. Absolute zero where a molecule stops moving altogether and is frozen with absolutely no movement of the atoms has not been able to be found. So is absolute happiness, with no fear or hate or desire coming in the way possible? Or is it, like temperature, just degrees of happiness.
Is happiness based on a a heirarchy of needs, like Maslow's or is it more elusive than such? Happiness one of those vauge and ever-changing ideas that we use to express certain feelings that we have, certain emotions.
There is not much done in the way of mixing physics with psychics, the concrete world connected with the abstract. So what if you considered emotions as energy? For example, hate energy and love energy. Energy, according to Einstien is mc². The m standing for mass and the c standing for the speed of light in a vaccumn. So if emotions have produce a certain energy within us, as often described with people feeling that they have more or less energy, then they must mave a mass. Of course this could be considered nutritional science. But why do some people get depressed while others stay mentally healthy? There must be some sort of emotional weight they are carrying.
While there may not be an answer to these questions now, the future is bright for those searching for a new and different way of looking at things.