Billye, i do hope you can get to the bottom of this, it does sound awfull.
When i first read your post i wondered about your water intake, but thought this
is complicated and should be left for the likes of Mrs D to answer.
I just wanted to mention that when i take any medication, if i don't drink a full glass of water for each pill i feel that toxic like feeling and just feel totally rotten , but once i have enough fluid i come good again, and seeing it's hot in your country now drinking plenty of fluids is pretty important, if your tap water isn't to flash to taste, then if you boil the water first , let it cool down and wack it in the fridge, with some lemon slices in it, defiantly changes the taste.
all the best
Brian