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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.
Yes there is small risk of aluminium toxicity and high magnesium level in the body.
Diarrhea, nausea, headaches can be manifestations of that possibility.
You should discontinue gaviscon and symptoms should subside gradually over 2-3 weeks.
For acid reflux you can try over the counter Ranitidine 150 mg once or twice daily.
Viral infection is another possibility and more common cause by the way.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 on top).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/