noise

i have a 1994 - 1995 (not sure which one) buick century whenever i startit up it starts fine it idles fine it is all fine untel i accelerate then it makes a loud groaning sound that slowly fades away afer i get going faster but it always does when acclerating from a stop or slow spped this started about a week or two ago after i acidentaly ramped over some traintracs on a hil ran off the road and got stuck in a mud hole :) also after anything like a sharp turn or slamming on the brakes the anti-lock light comes on, it dident in the past, now sometimes event the parking brake light comes on what could couse this and how can i fix it? thanks

You must have damaged something under there. Raise it up on ramps or jack stands high enough to get a good look with a light.
Look carefully at the engine and transmission pans for dents or oil leakage. Also you may have bent some suspension components. If you drove all the way over the tracks check the parking brake cables and mechanisms for damage. This could explain the parking brake light.