Hi welcome to HCm I have gone thru your query regarding muscle pain in shoulders,upper arms and legs . I can understand your your concern . Dear, Any serious or just simple fever can cause you tiredness and pains .But as per your blood work such cause is ruled out . The other conditions responsible for such symptoms are:- Aneamia - may be even more common in post menupausal women or who are still having periods , which can be most probable cause of your problem . Other conditions can be Lack of sleep , Underactive thyoide , Diabetese ,Worry ,Anxiety , Depression , Lack of energy and Lack on proper phisycal activty . Don t worry , find out a cause for your trouble , remove it and follow a regimen to boost your Immunity as below-- Drink lemon juice in a glass of water with a pinch of salt and black pepper , thrice a day , is very energetic , good appitiser and alley pain very fast . Try eating several small meals instead of 2 or 3 large ones. Eat Balanced diet including all essential nutrients - fiber , vitamins , minerals , nuts and antioxidants . foods, such as chese ,milk ,veges ,fruit rice - moong dal khichi , oats , porriage . Crushed an inch of ginger with salt and black pepper can alley gas from your body give relief . Turmeric powder in a cup of hot milk and a soon of almond oil helps alley pains . Do not use aspirin or medicines, may irritate your stomach and increase your pain. Avoid fried fast foods too much of sugar, tea, coffee ,alcohol , smoking ,stress ,constipation and dehyderation . To strengthen your muscle ,do Walk, Yoga ,stretching Pranayam - deep breathing , Vajjarasan , Mandookasan , Bhujjangasan , Kapaalbhati Agnisaar , meditation under a qualified trainer ,will help for long lasting relief . If problem persists or worsen ,rush to your Doctor ASAP . Hope this helps solves your query .Take care , All the best . Don t hesitate to get back if have any further query