We both find here at this house that 3mg of Melatonin works well.
Hubby takes chlorpheniramine 4mg at bedtime for his allergies, and I take 25mg of diphenhydramine.
If you add in the melatonin, you might be able to get away with 25mg of the diphen. I have found over the years that tolerance happens with it too. So that may have happened to you.
My doctor told me people on Benadryl have more car accidents, and pilots are suggested to not use it at all!
So far I have found that the upper limit for safety for those concerned about D is 4000IU daily.
Perhaps your insurance will allow electrolyte tests? Testing for elevated calcium would then possibly tell you more information anyway?
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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