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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.
Most likely cause is drop in blood sugar level from fasting.
That can trigger autonomic response from the body.
The strss hormones can stimulate the nerves controlling stomach intestine even the sinuses.
The symptoms tend to subside with food or when you break fasting.
Body also adjusts to the situation slowly.
Since the symptoms are not present other times, this is not likely serious.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/