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Drinking a glassful of water after waking up from a sleep is a very healthy habit. Your symptom indicates that you are not adequately hydrating yourself. Drink 1-2 L of water in 24 hours, it will help to flush out any type of toxicity from your body system. Take fruits, berries, soups and juice along with your normal diet.
Feeling thirsty is also indicative of high sugar level in the blood, have fitness tests done to ensure you do not have any developing diabetes
. Low grade fever
can be due to developing typhoid infection. Typhoid generally shows step-ladder rise of body temperature, get blood cultures done to rule out typhoid bacilli
or any other pathology in your blood.
You have not mentioned your past history, low grade fever can result as a side effect of any medicine you have been taking or due to addictions.
Take analgesics and vitamin B and E tablets for relief. Consult a doctor get clinically examined and diagnosed so that treatment can be started as early as possible. Take care.