
What Causes Severe Fatigue, Dizziness And Shortness Of Breath?

Fatigue
Detailed Answer:
Very sorry to note how you feel lately.
I strongly suggest you seek prompt medical care. If I were you I would go to the emergency to get vital signs checked like pulse and blood pressure among other things.
Once stable, further evaluation would be in order to determine the cause of your symptoms.
When I see someone like you in my practice, I typically order the following blood tests in addition to a detailed physical examination:
CBC (Complete Blood Count, also known as Hemogram; includes Hemoglobin, WBC and Platelet counts)
Electrolytes (Sodium and Potassium in particular)
HbA1c (Glycosylated Hemoglobin = your 3 month glucose average)
Liver function tests (SGOT , SGPT, Albumin, Bilirubin, Alkaline Phosphatase)
Kidney function tests (BUN, Creatinine)
TSH
Free T4
Anti Thyroid Peroxidase (TPO) antibodies
Anti Thyroglobulin antibodies
25 hydroxy Vitamin D
Serum Cortisol at 8 am

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