Help!! Any advice/suggestions on strange electrical issue?! No power, but circuit not tripped??

So this has happened all of a sudden. I go into the (detached) garage to leave, & try to switch on one of the two lights in the garage, each controlled by their own flip-up, flip-down, standard light switch, & nothing happens. I figure the bulb has burned out, think nothing of it, no big deal. I get into my car to leave, & attempt to use the remote as usual, but now, the garage door won’t go up.

So, I get out to investigate, & the little light on the wall controller unit is on, but extra dim, but still won’t operate the garage door. I press the button, nothing happens. I start to realize that the light switch not turning on & now the garage door issue might be connected.
I then go over to other light switch on the other side of the garage, to try to turn that light on, which happens to be a compact fluorescent bulb, & same thing - doesn’t work. Although this bulb is very, very dim & ever so faintly flickering — which I don’t know if that is a result of the type of bulb, or indicative of this larger electrical issue.

I go out to the circuit breaker, & none are tripped. I locate the one responsible for the garage, switch that one off, & then back on — no change.
Nothing in the house seems to be affected. It’s isolated to that one (room?) area, but affecting the regular outlets as well as light fixtures. So in the interim I went back to the circuit breaker & switched the garage one off, as a precaution.

I have no idea what to do about this, or how to even narrow it down. For what it’s worth, I have a volt meter, but no clue how to use it. Does anyone have any idea what could be causing this, or any suggestions??

Thanks in advance! I could really use some advice! 🙏