Lemon juice for fatigue and brain fog???

My son with POTS turned 17 today. He came into the kitchen in his usual state of fatigue and brain fog and said “ I have a craving for lemon juice.” He poured about an ounce perhaps into a shot glass and drank it straight down. I saw him later and he was obviously more awake and less foggy. He said he was going to have another shot of lemon juice. This is the best I’ve seen him feel since before the holidays, which really wore him out.

Anybody else ever try this? I am NOT suggesting it, just wondering. I would personally water it down if I was gonna try it.

If you do, rinse your mouth afterwards, you don’t want the acid on your teeth!

Also Google says it can cause stomach upset.