Well, you have to give us more information.
What civ are you using? What map size/type? What difficulty level?
What turn are we talking about? And what game speed?
Also, and probably most important just how do you usually play?
1. Well in my elven game i used ljosafar (sp*), right now im the Illians
2. Mapsize either large or huge, type is Eubrus (or however u spell it

)
3. I use that flexible option so it changes depending on my score. Im usually prince or above
4. game speed is normal
5. How do i usually play? Thats a hard question to answer, it really depends on my starting position.
In my elven game, i had no barbarian issues, so I went strait to infrastructure and trade. I had plenty of gold amassed, research was good and i was doing great. I was in an amazing spot for defense. I blocked off the mountain pass to my east so the nation there never expanded

, north and west was all sea, and south was all the forests i could want. A small mountain passage connected me with my enemies, the clan, hannah the irin and that angel civ that spawns (sorry still rough on my ffh knowledge). They occasionally sent giant doomstacks my way, so i kept a giant doomstack at the passage. Midway, i had no problem defeating w/e they threw at me. But i noticed that i kept having to lower my research level, cuz my gold per turn kept dropping and dropping. By the end of the game, all 6 or 7 of my cities were producing wealth and my research level was at 40-50, and i still would have a negative gold per turn. I barley won the game with that temple of lumonocity (or w/e its called

) victory. My inflation was 500 something =0. About 10 turns were remaining.
In my current games im playing as the Illians. I had a few barbarian issues at the start so i had a decent size military built up to hoard off the barbarians. But soon they were all gone and im expanding like crazy. I have about 5 cities now, with room for 1 more before i go to war. I'm on turn 330 and my inflation is 25. I dont want it to end up like my elven game. So any tips?