drinking plain water will not cause fluid retention. eating salt and female hormones sometimes can cause fluid retention during parts of the month.
you should keep drinking your water. try to cut down on your salt intake.
it sounds like you have to avoid gluten and milk and lactose and dairy
avoid sodas and processed foods and preseratives as well which can lead to bloating.
eating asparagus can be a natural diuretic which can help you get rid of some fluid out of your body. coffee and caffeine can help as a diuretic as well in some patients.
do get your thyroid hormone levels checked
see if going on a birth control pill can help your hormone swings.
let me know if you have other questions.
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