Would anyone agree that some PLs have to be listened to for a couple of months or so to achieve the full desired result?

For example, I have been feeling very low and unhappy for the past couple of years. To turn this around, would listening to Happy For No Reason for a few months, or until I see and FEEL a difference from deep within, be the best way to approach this?

What other PLs can I use in conjunction with Happy For No Reason? Or could I listen to Happy 2 or 3 times a day?

Any days that I feel high or good that an opportunity has come to me from nowhere, the negativity that surrounds me brings me right down, and I find it hard to climb up again.

Listening to a PL for a week I have found not to be enough. Can I listen to Happy indefinitely until a great feeling is achieved?

Big question I know. But it needs addressing...

Thanks to those who could spend the time to provide me with a great honest answer.