I know that feeling, just took my CMEL ride, I way over studied, 95 on the written, did the weight and balance 3 different ways to show him I understood how different loading would affect CG, his only question was if I did one. Questions were simple and basic, i overthought it big time. Even though the oral and ride was easy, I was so physically and mentally drained. I pressured myself to be perfect (which I wasn’t) plus I had a multi vfr only restriction because I took my multi ride prior to my instrument. I had a family vacation in Destin scheduled to leave two days after my ride in a multi and enough weather in the forecast that I didn’t want to have to go vfr. Failure was not an option, just a little extra pressure!