Thanks for all these additional details.
I am sorry to hear about your problems.
Your symptoms are suggestive of Viral stomach flu. Usually such symptoms are viral and self limiting in nature.
You need to take Tab Imodium(it is available as OTC) to reduce the frequency of bowel movements ,this can be taken maximum up to 4 times as per the requirement.
Such dizziness and and fatigue is associated with Viral stomach flu.
You should Tab.Acetaminophen to get relief from stomach ache and cramps. You should eat something containing salt, such as crisps or soup.
You should maintain good standards of hygiene .
You can take Ready-mixed rehydration sachets (eg Dioralyte, Rehidrat). You should Keep yourself hydrated, and maintain fluid levels.
If you notice fever, Blood in stool, any sign of dehydration then consult your doctor.
The common signs of dehydration are-
Dry mouth, sunken eyes, low urine output, lethargic.
If you notice any of these signs, or develops fever then see your doctor immediately.
Most likely, such symptoms would get resolve with such measures, in next few days. Please take adequate rest.
Hope this helped
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