Hello
Since you are 43 years old and feels
tiredness, chills , shattered , forgetfulness .
All these symptoms are off and on , may be due to these reasons :
1 Perimenopausal syndrome , just before onset of
menopause the levels of estrogen and other hormones starts decreasing , so this may be the main reason. Diagnosis can be confirmed by blood examination for estrogen , androgen ,
progesterone .
2 Anxiety or tension ( stress ) is another most common reason of such symptoms .
3 Thyroid
hormone imbalance . Diagnosis can be confirmed by blood examination for T3, T4 , TSH .
As I have noted due to imbalance many patients feel such symptoms .
So deal as mentioned above , consult a
primary care physician and get his opinion .