Some people think the fall of man had something to do with sex, but that is a mistake.
A really happy person is hungry for the things of God. If so, what would it include? However it is still very hard to explain. The happiness the Bible advocates does not come from what you have. Comments which are simply attacks on myself, or are done in bad taste, or use rude language, or are possibly defamatory will not be posted.
When your world seems to be falling around how do you have happiness? God made us: invented us as a man invents an engine. How would you define Christian happiness?