Interesting point. That is precisely what I fear: if I fix the unhappiness would my philosophical beliefs get diluted. Maybe that won't be the case, but I don't know that right now.

There may be Nihilists out there who are very happy and never feel any despair, and that's what I'm after too. Nihilism definitely doesn't mean you should be unhappy. In fact, in light of no meaning, the sole purpose should be to seek happiness (why would anyone want unhappiness). But it's just bit difficult for me to feel blissful and happy all the time in spite of the full awareness that it's pointless after all. Occasional despair is inevitable from Nihilism, won't you agree?