Well I'm here to tell you that if your mood set point is lower than you'd like it to be, there's no quick fix. Sure, you can take SSRI's or some other prescription "happy pill" to make yourself feel better. Those have a few depressing side effects, like impotence, anorgasmia, weight gain, and a general feeling of flatness. Who needs a life with no lows but also no joy? We all need joy.
If you have the capacity to feel sadness and pain, that means you are not dead yet. You also have the capacity to feel joy. You may not remember how, but you can relearn it. Joy is there, somewhere, waiting for you. So do not give up hope. The path to a happier reality is a slow one, full of conscious decisions and hard work. Diet and lifestyle matter. The way you choose to think, matters. The values that you espouse, they matter too. Do not give up hope. Pick one thing that you can do for yourself and do it today. And call me if you need to.