Is it true that pickle helps with a hangover?

True, but any other liquid with a good electrolyte content will help no worse or even better. Salted mineral water for example.

The main reasons for a bad state of health with a hangover are the dehydration of the body and toxic metabolites accumulated in the blood (the results of processing) of alcohol. Brine, mineral water, gatorade, etc. help restore hydration and electrolyte balance, and stimulate the elimination of toxins down the toilet. Ideally, half a liter of mineral water can be sucked BEFORE sleep, then life will be much less terrible in the morning.

Drunkenness with a new dose of alcohol works only for serious drunks who no longer have just a hangover, but withdrawal symptoms (withdrawal symptoms). A healthy person will not feel better, although it may become easier for him to endure this state in a drunken state, because in a drunken state, anything is easier to endure. However, this is fraught with the transition of "drunkenness" into a new booze with disastrous consequences. If it's really hard, then a good option is to smoke a joint. It will also become much easier to live.

Well, brine makes up for the lack of salts in the body, it feels good in the mouth.

In fact, modern brine does not help with a hangover to the extent that it did before. Vodka was added to the brine, so there was a degree and it acted on a hangover, as now, say, a bottle of beer.