While driving home in my 2004 Trailblazer it stopped driving while it was in Drive. I would press the gas and the engine would just revved.

that is a hum dinger, largest ever posted, in one shot.
very good.!
one word , the transmission slips. (never drive a slipping tranny)
overheat indicator.! that is key.
many newer cars will change the transmission shifting any time
the engine over heats.
and overheat wins over transmission , every time.
if the engine burns up, what good is any transmission.? nada.

solve overheat first.

slip or flare.
is when the engine RPM rises fast and the car dont go faster.
SLIPS.
and slipping burns up trannyclutchs and increases the damage. inside the transmission, dont do that. dont allow it,
park it and fix it.

on some tranny there is a temperature sensor that the TCM
watches and changes shift patterns based on AFT fluid temps.
and if the ATF fluid gets too hot , it takes actions. to keep the tranny from harm.

why not get a scan too and see what DTC errors there are..
DTC, engine overheate.
DTC< tranny overheat (caused by above)

sounds like a broken shift cable. (the connection between the shifter and the gearbox) common symptoms are the shifter move easier than normal.and does not move to any gears (not even park or neutral).

When the Check Engine light flashes it means there is a significant emissions problem detected and it needs to be fixed very soon. Continuing to drive with this condition will destroy the catalytic converter. You may have gotten debris in one or more of the injectors when the gas got low.
The first thing to do is get the codes read and find out what the computer is reporting bad.

This sounds like the fuel level sensor in the gas tank is going bad, or there is a bad ground at the tank. A technician using a scan tool can monitor the actual fuel level data to verify.
Another possibility is a bad stepper motor in the instrument panel, each gauge had a stepper motor to drive the needle.

Vent soleniod located on gas tank filler neck is faulty

I'd take it to an parts store and get a reading. Sounds like a MAF sensor possibly.

check for 12 volts at the battery if it is anything less you will need a new battery.

when did you last check the auto gearbox oil????? it sounds like it is very very low on oil to me,

sound like a blocked catylitic convertor, remove down pipe on exhaust and drive to confirm, also check fuel preasure regulator and delivery preasure

its in a relearn right now drive it for awhile in town stop and go traffic good luck