Our expert says:
My suggestion would be that you see a doctor with this list of symptoms for a full medical examination and some blood tests:
Pressure and fullness in head, blurred vision and lightheadedness could be signs of high blood pressure
Tiredness, weakness after exercise, blurred vision can be signs of diabetes
Sore neck, cracking or popping noises in the neck with headache can be a sign of muscle spasm of the neck.
Nasal congestion, fullness in ears, dizziness can be signs of sinusitis or ear infection or allergic rhinitis
Troubled sleep, reduced concentration, tiredness, memory loss can be signs of depression or anxiety
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