Removing Happiness…

It sounds like you are procrastinating, which is a result of being afraid to do something and doing everything in your power to avoid it. However, I would not recommend inflicting damage on your happiness, since happiness is the goal! (Mind you, I've considered this myself, but you might want a second opinion.)

What you might do instead is look at your reasons for not doing XYZ and blissing out instead. You said something about failures–that's a great starting point. You probably expect X endeavor to fail and/or are terribly afraid of how unpleasant failure would be. If you can take out fears like that, you can probably start making progress again.

Try putting the happiness on a schedule. I've been kind of a video game addict much of my life, and I find that when I schedule time so I can play games every day, even if it's 30 minutes or an hour, that “takes care of” the day for me. My underlying fear is that I won't get a chance to play my games so I procrastinate from other stuff, so if I schedule it in, I have that guarantee that games will be played that day and my mind no longer fears that it won't happen.

One author, Andy Shaw of “A Bug-Free Mind,” instructs and repeatedly insists (“Yes, I'm gonna keep bringing this up!”) that the first key to success is to have 15 minutes of positive thought every single day, as it will give you control of your mind, and you can start creating your life by design. All other things being equal, happiness is a powerful state, while fear is the opposite.

One more thing: you made a remark about dying of starvation, so consider this, if only hypothetically: if you were going to die, would you prefer to die happy or would you prefer to die feeling sadness and despair?

And if you feel bad about being happy, it's time to use PSTEC to deal with those feelings and beliefs. Obviously, you recognize that there is a problem and are addressing it. Feeling guilty or ashamed or bad about it can only slow down your progress, and may even contribute to keeping the situation “stuck,” so tap on that.

As others have said, being blissful is something most people dream of but if you perceive a problem it seems to me that your emotional state is not actually the issue.

Is it the lack of perceived functionality whilst in that state?

If so then how about removing the belief that you can get nothing done when so happy and adding the belief that you can be productive and happy at the same time?

In other words allow the happiness to persist but add in the ability to function very usefully in that state by working on your beliefs.

I'd say that whether they do or not will most likely revolve around your own expectations. The recent forum post by Benjamin in another thread illustrates this principle perfectly. 
By changing his own beliefs women have started treating him very differently.

Here's a question to consider that might prove useful….
Has anyone in the history of the world ever been taken seriously when they were happy?

As regards tying functionality to happiness….
One can use one state or behaviour to trigger another automatically either by means of suggestion (eg PP) or by creating a habit over time. When undertaken by design it starts with the suggestion anyway.

The sequence of belief shifts needed would be:
It's possible.
I can
I will
When I am happy I … (Intended outcome)

Kind Regards

Tim