This does not sound like heat stroke.
Your symptoms are quite typical of a viral infections.
Viral infections presents with feelings of hot and then cold, headache, weakness, fatigue.
I would suggest:
Fluids. take a lot of fluids like water, fruit juice and Gatorade.
Measure your temperature two or three times during the day to check for fever.
Tylenol tab for fever or feverish feeling- take one 500 tab when you are feeling feverish or hot, gap should be at least 6 hours and no more than 4 tabs a days.
Otrivin nose drop - if you have blocked nose
Decongestant medicines: Like Benadryl Allergy Relief or Triaminic Cold and Night time cough syrup - if you have cough
These steps are generally sufficient for a viral infection.
But in these times of Corona infection, it is very important that you report any fever if you measure a fever above 101 degree F to your doctor. Your doctor will determine whether you need to be tested for Corona.
Also report immediately in case you have severe cough, difficulty in respiration, chest pain or heaviness, diarrhea, skin rashes, or any other unusual or severe symptoms.
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Thank you and I wish you the best of health - stay safe!
Dr. P. Jyoti