TransmIssion

Last weekend I took my truck ,2003 Chevy
Silverado 4x4 out mudding, it was running great
had a blast, went to the car wash and washed it
and on the way home it started cutting out real
bad, I put has treatment in it thinking it may have
gotten water in the fuel and my gas millage was
like 7mpg. I changed the fuel filter and it was
horrible, it seemed to be running a little better, then
last night we were out riding and going maybe 15
mph and it jUst quit moving, the transmIssion fluid
levels are perfect and there was no oil or anytHing
anywhere, I tried all the gears and even tried four
wheel drive and it still won't go, the rpm well go up
when you rev the enGine but it won't go anywhere,
this is my only veHicle and I'm a single mom so
any advice would be greatly appreciated