Hi
Welcome to the forum!
Since you are taking Synthyroid and birth control pills there is a possibility that your symptoms (nausea worse with exercise, fatigue, dizziness and daily headaches) are caused by gastric reflux or GERD. The treatment is by a combination of acid reducing drugs and life style changes.
Life style changes such as: Avoid heavy meals. Avoid too much of caffeine, tea, fried and spicy food and drinks both alcoholic and non alcoholic fuzzy ones. Avoid heavy exercises within 4 hours of a heavy meal. Raise the head end of the bed by pillows to 30 degrees. Go to bed at least 2 hours after food.
The other possibility is compression of the spinal nerves in the cervical spine region. This can happen due to overuse of computers, work involving straining of neck, canal stenosis, bone disease, spondylosis, poor posture etc.
Please discuss with your PCP or GP as confirmed diagnosis cannot be given on net. Hope this helps. Take care!
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