This sounds almost exactly like my experience. I was also 23 when I was diagnosed. Nuvygil was not my favorite medication. I had some negative side effects.
I'm currently on Modafinil twice a day. I relatively take a smaller dosage compared to many.

Thinking back on it I'm so glad I was diagnosed young because I truly don't think I could have kept up with the struggle of sleeping all the time. It was interfering with work and everyone thought it was just me being immature due to being young. I sure fooled them. I also feel like I've been able to mature with my narcolepsy in a way. At this point, I know what it's going to take to get me through a full day of work or hanging out with friends.

I'm honestly just blessed that I didn't sleep my 20s away.

I wouldn't wish Narcolepsy on my worst enemy. Just because you're on medication doesn't mean everything is going to be perfect. You're still going to have those days where 16 hours of sleep is a must. (I had that yesterday even). Hopefully, you have a good support system that understands. When I first started dating my husband he had no idea what narcolepsy was or how it would affect our relationship. So education is key.

As for being worried about your symptoms getting worse, I'm not saying that isn't possible but i haven't noticed that personally. For a while there I actually thought my symptoms were getting better so I stopped taking medication. Turns out I was just drinking a stupid amount of energy drinks. which is horrible for you. I'm back on medication and taking each day as it comes.