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Hello I'm Dr Chip
Where is the headache located?
Any neck stiffness?
This sounds like a sinus infection with post nasal drip causing the nausea and blurred vision
Since it's gone on for a week, while you can try a saline nasal irrigation system and oral probiotics, it would be better to see your doctor for a course of oral antibiotics
Please let me know if you need any more information
Sorry--what more information did you need?