hello and welcome to HCM forum,
according to the medical history presented by you it seems you had an upper respiratory tract
infection couple of days back, as you were on keflex.
i would like to inform you that excessive thirst is due to dryness caused following to throat infection
, and the salty taste is due to the acid reflux
also, white color patches which are present over your tongue are due to inability to maintain your oral hygiene
as you were down with fever and sore throat
, kindly use a soft bristle brush to clean your tongue, do not apply excessive pressure.
you can also use a mouth wash (twice/day) ,
I would recommend you to drink sufficient water and include vitamin C in your diet to boost your immunity. i hope i answered your query,
i wish you good health,