I am not sure what your exact question is.
So I will tell you that this does not sound heat related, given the precautions you tool.
It sounds like you have an underlying problem.
Balance problems can be from
The fatigue can go along with any of these.
Or any other underlying illness such as anemia, iron deficiency, and other problems.
You need to arrange to see an internist this week.
And I would get a brief exam and going over at urgent care now.
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