Can you tell me how to get back to happiness?

Bit by bit: First you must figure out where your happiness went. Do you know what made you unhappy or was it more of a mood change generally. You should speak with a trained helping professional. You can get some names from your PCP. You sound like you could be depressed and that can be helped with medication and therapy. Take the time to see someone because you can get your happiness back with help.

Sure, consider...: "You don't get to choose how you're going to die. Or when. You can only decide how you're going to live. Now." Joan Baez