Mmm. How long have you been playing the material? If it's a long time, you're probably dwelling on it longer than you should be.
I go through phases where a I have 'nemesis' tunes. Songs I know I'm not going to get through unscathed. Thing is, it passes over time; for me anyway.
It used to be Footloose. I don't even think about it now. Then it was True. I used to be wracked with fear about the sax solo section. History now.
I remember I did a Bowie gig once and the audience wouldn't let us go. We did so many encores we were running out of songs.
Keys said let's do Five Years and I said I couldn't remember it, despite playing it hundreds of times, but I had been put on the spot to recall it and I couldn't.
Completely screwed it up, but nobody gave a stuff about it.
Then it was Somebody To Love. Boss that now. Then it was Save Me - do it my sleep now.
I'll have the same problems with Spread Your Wings and I Want It All next year when we do them.
The more pressure you put on yourself to perform a song with 100% accuracy, the worse it will be.
Where are you in Essex?