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,
take care.

Hi,
What i understand after reading your symptoms is that you may have developed a fungal infection like candidiasis which if not being treated maybe, is manifesting itself in the form of low fever. Candidiasis is seen as soft white fungal patches, which you have already mentioned. Many medications though necessary and prescribed by doctors in long run may end up reducing body's normal resistance to milder bacteria, viruses and fungi. therefore they (your current medicines)need to be monitored at a regular interval.
I would strongly suggest you to meet your doctor and after confirming the diagnosis he may put you on antifungal drugs if required. Till you visit the doctor you can start using an antifungal mouthwash twice daily along with warm saline gargles 3-4 times / day to stem the infection.
Regards