1997 Chevy Blazer head lights flickering

i have read similar answers to my question, which is my headlights flicker from bright to dim and sometimes my running lights will quit worker. This only happens after driver for a while a night, so i usually drive with fog lights. I do hear a clicking noise in the relay area when this is going on and the relays are hot, but i do belive its the turn signal switch in the column becouse i broke the hazard light off a while back which made the car act realy strange, I have since rigged the hazard light switch back in place to where everything works. Could this be the issue or do you beleive its a relay or headlight switch. Also i smell transmission fluid all the time after driving for a while, it doesnt get hot, or even low, but occasionally the gears slip, what could this be. I have had numerouse work done mainly on the engine but eventually replaced it, also it seems to want to surge when you are driving only when your foot is steady on the gas, not when idleing...please advise ...oh its a 4.3.