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What you had around the Christmas was probably not just Flu. It is most likely a virus causing Upper Respiratory tract infection. A cold and flu will not cause that sever a cough. The viral infection has got an incubation period and yes you are right it matches with the onset of hot flashes. It is very difficult to say what kind of virus this is, but since your symptoms are resolving there is no need for any testing.
The hot flashes could be due to the immune reaction your body come up with to fight off the virus. But honestly it is very difficult to say for sure. But my best guess would be this.
What you are experiencing is a post viral fatigue which is know to cause swimmy head / light headiness etc. This is common following a viral infection and can last upto few weeks. But most individuals will recover in few days. If possible take moderate rest (avoid strenuous exercise ). But you SHOULD stay active. You can work / go out etc. Stay hydrated too.
If the hot flashes persist and if you are on Thyroxin medication, consider checking the Thyroid function as excess medication rarely can caused flashes.
Hope this helps
Feel free to ask followups.
Patient replied :
About how long does the viral fatigue last? Days, months?
Typically a week. (varies with different types of virus ). It can last upto months , but that is more of an exception than a rule. If you have sever or persisting symptoms you should review with your Doctor.