I went to an Oktoberfest event last weekend. There were 3 stages with loud music and lots of people. I was there for 3 hours. The loud music didn't bother me for the first two hours, but after 3 hours, it was like I hit a wall and it was too much stimulation. So we left. Next time I'll try to stay for 4 hours.

Try an Expose & Recover strategy. You did 45 minutes at the club, so rest for a week, then try to do an hour, and increase your activity level a little more every week.

You mentioned you went out "tonight." Did you go to the club and then write this post in the same night? You need more time to recover.

And always avoid risky activities, like Heavy drinking.