I went to my second Divine Liturgy yesterday, unlike the first time I was able to follow the services more closely.
It wasn't a negative experience, I felt fine after going there.
Though I was really tired afterward, I had to clean the house and walk the dog afterward.
If you could follow well at your second visit, you are doing better than I was.
I had a tendency to get lost a lot. But it still didn't take long at all for me to learn. And now I understand enough bits of the Greek even that I have some ideas what is going on even if I didn't have context or text. Having the same pattern every week makes it easy to learn.
Sorry you ended up tired. I guess I did at first too, but now I'm so endergized by it that I feel almost like I've missed something on a "short day".
. I hope it will become like that for you too - if you are already following along that's probably a good sign.