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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Your blood pressure is low normal but yuor pulse is also low.
Pulse should be high as expected response from the heart when blood pressure drops or you have an infection.
persistent light headedness is also concerning.
Underlying heart condition should be ruled out.
Yes your symptoms can be due to the bacterial sinus infection.
You should go to the ER for a heart evaluation first.Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/