high,thanks for query.Just having some weakness does not point to
dehydration.It could be there but it is not must.Your pulse rate is high ,you might have
fever also.Take more of fluids and take light diet and rest.In case of discomfort you can take fever medication after measuring fever.Please measure your blood pressure and pulse rate after couple of hours to have an idea.In case of problem persists and you do not feel comfortable with your self please speak to your doctor.
wishing you good health.