Thank you for posting your query.
You need to be examined to determine the diagnosis and find out what the knot could be. However, if possible, please upload a picture of the knot in the temple area.
Your symptoms sound like migraine
and visual symptoms could occur with migraine.
You would improve with medical treatment, and there is no need to worry.
I hope it helps. Please get back if you require any additional information.
Wishing you good health,
Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad, India
Click on this link to ask me a DIRECT QUERY: http://bit.ly/Dr-Sudhir-kumar
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