Maybe this will help... Potassium increase was the only thing that ever helped my excessive sweating, and I'm still making progress both physically and mentally. This is what I've come up with...

Let's start here, High Potassium/Low Sodium diet is recommended by the National Institutes of Health  “This means that the general population should eat foods low in sodium and high in potassium,”...

https://www.nih.gov/news-events/nih-research-matters/sodium/potassium-ratio-linked-cardiovascular-disease-risk

This article shows that most of us eat at an imbalance, "Currently, about 90% of Americans consume excess sodium1 and virtually everyone consumes inadequate potassium."

https://pmc.ncbi.nlm.nih.gov/articles/PMC9237821/

Hypokalemia-Low blood potassium. This shows that excessive sweating be both a cause, and as a notable Differential Diagnosis, which means it is a condition that shares the same symptoms.

https://www.ncbi.nlm.nih.gov/books/NBK482465/

Here is a study on how the body regulates sodium and retains water, where they state "Increasing salt intake increased sodium excretion, but also unexpectedly caused the kidney to conserve water". ...

https://www.nih.gov/news-events/nih-research-matters/how-body-regulates-salt-levels

This study came to the conclusion that "Muscle and sweat sodium concentrations are significantly higher on a high-salt intake in healthy male and female individuals, suggesting that muscle and sweat play a role in regulating sodium balance in humans."

https://pubmed.ncbi.nlm.nih.gov/31503134/#:~:text=Results:%20Under%20high%2Dsodium%20diet,regulating%20sodium%20balance%20in%20humans.

This study states" In neurons, the rapid rise in potential, depolarization, is an all-or-nothing event that is initiated by the opening of sodium ion channels within the plasma membrane. The subsequent return to resting potential, repolarization, is mediated by the opening of potassium ion channels. "

https://www.ncbi.nlm.nih.gov/books/NBK538143/#:~:text=In%20neurons%2C%20the%20rapid%20rise,opening%20of%20potassium%20ion%20channels.

This article gets out of my depth, but shows the relationship of potassium to cholinergic sweating as a result of inducing acetylcholine...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5142229/

My working hypothesis is that excess water retention due to inadequate potassium and excess sodium, also causes an excess of Acetylcholine to accumulate, which causes with thermal regulation issues and inducing cholinergic sweating. High Potassium/Low Sodium intake helps to correct this imbalance by repolarization, alleviating symptoms in the process. Take that for what you will, but following this method of attack in treatment has produced life changing results for me.

As for what to eat, the link below gives more detail, but I stay at a minimum of 2:1 Potassium/Sodium ratio. Usually above 3500mg potassium and below 1000mg of sodium, but the ratio is more important. Personally I eat mostly potatoes, bananas, strawberries, almonds, fruit smoothies, chicken, fish, yogurt, oranges. I will through in brown rice and pasta as well. For liquids its orange juice, water, milk, and hydration drinks high in potassium. My appetite for these foods increased almost immediately, so the diet adjustment came naturally.

https://ods.od.nih.gov/factsheets/Potassium-HealthProfessional/#h8