Georgia. I know how you feel -- sometimes the little stuff piles up and it's easy to feel one more thing is just too much to bear. You get to feeling like you're swatting at an endless swarm of bees -- you are doing sort of OK keeping ahead of them, but then the next bee is the last straw! I had a spell of this recently and seeing a mouse in my house (they just come in for the warmth this time of year) was my last straw and I just sat down in the kitchen and cried like an idiot. I wasn't crying over the mouse, but over the seemingly endless stream of problems picking away at me. I, too also felt silly about it, because it's true that there are a lot of people out there with a whole lot worse problems than I have, but that mouse looking at me from under my dishwasher just pushed me over the edge. How silly -- I'm helping a family member who is dying of cancer, but I'm reduced to tears by a mouse looking at me!
Back in September I had an engine light problem, too. It had come on who knows how long ago. But here, you can't pass the air quality emissions test thing that you have to have to renew your car tags if that stupid light is on. So I failed the emissions test and so began my saga of trying to find someone to figure out exactly what was wrong and fix it in time so that I could get my license tags renewed before they expired and all the hassle that comes with something like that and trying to get it fixed right away. I envisioned it costing a fortune and all that negative stuff, but it turned out it was a bad fuel filter and I got it fixed for under $100 and then passed the test. I always feel so frustrated when it is a car thing, because I have no clue about cars, and half the time I don't even understand what they are telling me. Thankfully, my neighbor recommended a mechanic he trusted. Bad news is that during the course of all that I learned I need new tires, too. If it is not one thing, it is another, as my mother used to say.
Anyway, hang in there, and know that this happens to most of us at one time or another.
I agree with Sterling Oak above -- you could call your DD when you are setting out and let her know you are on the way and exactly what route you are taking let her know what time you expect to arrive and arrange it so if you haven't arrived by a certain time someone should come looking for you. That's what we used to do, too, and it works. Chances are, though, you'll be fine. After all, you were driving with that light on for however long without worry before you know what it meant.
Peace and love to you.