You did not update your height and weight so cannot give good views, so just chit-chat.

Food poisoning can inherit from what you consume 24 hours before.
So tomyam, curry puff, and coffee are possible culprits.
"Your cholestrol level consider OK" - why you lack confidence meaning your cholestrol level is borderline

You walk 2km to throw rubbish.... 2km, just to throw rubbish
Are you living in Japan? Japan law, some household items cannot be dispose as garbage.
So they dump TV far, far away.

Car wash + 2km rubbish throw + high BP = dizziness
food poisoning = diarrhea

First treatment for diarrhea = rehydration = water and rehydration salt.
Isotonic beverage helps rehydrate. Complete rehydration or not, depends on how much you drank.

Wash car then dizzy

If sugar burn out can cause dizzy
Because your stomach already empty due to diarrhea
Malnutrition also can cause dizzy

Squat cannot stand back up = most likely weak body from diarrhea, high BP, malnutrition.

You force yourself for another 1 hour = bad. Running on reserve and adrenaline.

You keep diarrhea because body trying to flush out toxin from digestive tract.
So more diarrhea = weaken body

Lose 2kg, but what is your base weight?

After you diarrhea how many times.... yes you possibly dehyrated.

High fever = your body still has infection maybe from food poisoning.
Muscle pain = your body is weak, wash car, wax, carry rubbish 2km. .... you hardly exercise or heavy body?
Oral powder = rehydration salt
Charcoal = absorb chemical in digestive tract
Morning everything fine = Congratulations.

Your underlying problem, weak health is still there, that's why your diarrhea lasted so long to recover.
But you will go on functioning, I suggest you improve your lifestyle to improve your health, but not enough info to offer precise solution.

Have a nice day.

Since you replied, offer you a tip; healthy food > exercise.