There are so many reasons to be unhappy in this world. You fail a test, you smash up the family car, love leaves you, your body is injured, the list is unending. Unhappiness needs a reason. Anguish is a deeper version of unhappiness. The futility of life and the inability to understand who you are in a world of feuding countries armed with atomic weapons, poisoning the air, land and water . . .
Happiness is a positive thing, but very temporal.
You may hit a high once in a while, but it's over too soon. Eat it or it will melt. Either way, it will be gone. Ecstasy, not the drug, is something deeper than happiness. Coming in contact with the source of life energies within you brings ecstasy.