Yeah, it's sometimes surprising how that is. I don't know whether it's the andrenaline or what, but after 10-15 mins of playing, injuries that have us wondering if we can make it through the gig, miraculously stop hurting. I've had monster huge blisters that I got from playing upright bass (which I don't do often) burst mid gig and within minutes become painless.
Glad to hear you had a good gig.