Your symptoms would suggest
(1) a thyroid abnormality, usually hyperthyroidism
where you get these hot flushes, fast heat beats and an overwhelming fatigue
- this can be checked with a blood test
for TSH, fT4 levels;
or (2) you are entering menopause
(presuming female aged 45+) or pre-menopausal - this can be checked with FSH, LH levels. If these are high, then the diagnosis is clear.
(3) Also you need to get your Blood pressure checked, and blood tests would include a complete hemogram and a randon blod glucose
(4) an occult infection - if you have fever, please get in touch with your doctor.
Please get back to us if you have any other questions.