Why were you taking any corticosteroids? And for how long? They can cause serious problems with prolonged use.
TSH etc may be affected by changing iodine intake.
Low thyroid function can cause thinning hair and sparse outer eyebrows.
Why are you even needing to discuss extremes of hydration?
High T and lower E levels depress SHBG. If really low, we need to consider things like diabetes. But some guys simply have really low SHBG.
If E2 is low, FT-->E2 and E2 will be low.
Note my earlier comments re mitochondria. Big factor in your low energy. Try 50mg Ubiquinol form of CoQ10, do not confuse with Ubiquinone! If you feel better, you have a problem with CoQ10, mitochondria and ATP production.
If I don't find your posts, ping in in the KSman is here thread with a link to your thread with pertinent post there.