I think I have your answer! I am not a doctor. But so very, very many of these symptoms are caused by adrenal gland disorders and pituitary gland disorders. See an endocrinologist or a rheumatologist. You are NOT crazy, your body is trying to tell you something!
Adrenal glands produce three types of steroidal hormones. If you have too much or too little of any of these hormones you can an array of symptoms that come and go. Those glands also control your sodium and potassium levels. Hyper or hypo active adrenal glands can cause tingling, chest pain, abdominal pain, sweating, lightheadedness; symptoms mirroring diabetes, blood pressure fluctuations, tendency to gain or lose weight; lack of energy; difficulty concentrating; poor memory; chronically high stress levels; mild depression; dry and thin skin; unexplained hair loss; heart palpitations; dyspepsia; constipation; hypoglycemia (low blood sugar); food allergies, high frequency of the flu or infections, lightheadedness upon standing, diabetes, unwanted facial or body hair, sexual dysfunction, weakness, nausea, paleness, altered consciousness, seizures, and on and on.
Simple to diagnose (go to an endocrinologist) and simple to treat IF you go to a doctor with experience with these issues. My advice to anyone who has weird symptoms and no diagnosis is to go see an endocrinologist!
Hope this helps! Could someone clean this up and repost it to other discussions where people might benefit? Thx!