I hope he's just a co-worker and not a friend. Because, he is a MORON!

When changing the oil, a little oil on the new filter gasket and tighten no more than 1/2 to 2/3 turn after the gasket contacts the adapter base. Probably time for the OP to think about selling his light sabre in exchange for a new motor.

This is the only logical "next step". Just drive it and listen for any new noises. Even it did cause some bearing wear (doubtful if you caught it in time) it may have many more miles left in it. A hot engine with overheated oil is going to cause low pressure. How far and how aggressive did you drive it? What engine do you have.
A engine can survive oil starvation longer than most people think. That residual oil is still slinging around and lubricating things....for awhile.

Yeah sometimes they just heat up and stop. Let it cool down and it will usually start again.

I'll see yer toast and raise ya one.....

Sounds like you got a very expensive lesson on how to do an oil change.

LOL. Poor bastard.

Right.
Look, in all honesty, you can go down all roads of worse and worst case scenarios but your engine is a sturdy one and can put up with a lot of abuse.
Don't know how long the first part of your trip was, but I guess you didn't get far before you noticed this. Then you limped 1/4 mile to the gas station, filled it up, another 1/4 mile to the meeting, filled it up again, and limped home. That's not a marathon distance.

I recall seeing some automotive program (might have been Top Gear) where they deliberately drained all the oil from an engine and took it for a drive on the highway to see how far they would get. Was amazed to see how far....and so were they. I would not be amazed to see your 4.0 pull through all of this.
So, there is hope: filter/fill and drive.

Agreed. All the speculation from behind a keyboard is worthless.

Test it. Try it.

Then you'll know.

As Forest Gumpp would say "It happens"

Some of you act like you have NEVER made a mistake

Did this the first oil change on my XJ hehe. Luckily I caught it before leaving the driveway.

Agreed on fill it with oil, put a new filter on, start it and listen. If the pressure continues to fluctuate and the engine isn't making new noises, verify that the sending unit is accurate (probably not...).

Damage has indisputably been done but these things are monsters and it may be quite livable.

Well stated and true.

I drove my 74 Monte Carlo over 100 miles with the oil light on. It was 5 qts low. Filled it up off I went. No light and it ran great.

Well, yeah but you had an old loose Chevrolet.

Not the high-tech wonder our beloved 4.0s are.

What does that mean? "BOOM!!!!!"? Did it explode? Did one of your tires blow? Did a piano fall on your Jeep?

You mention that now the oil pressure needle fluctuates when at stop lights so I assume you've addressed the filter issue, filled it with oil, and are now driving it? Besides the wobbly needle are there any other issues? I really want to know what the BOOM with five exclamation points was.