You are not sick,just thirsty.
This is what Im doing every day.It is based on my education as a doctor and life experience:
First think in the morning drink glass of water
last before you go to bed drink glass of water
Every two hours drink glass of water.
practice tai-chi sun style, basic form 11 postures, or
wu-shu 8 precious exercises, or
the core of hatha yoga-The sun salutation, or
chi qong where i recommend Standing on stake.
After 6 pm eat only fruits.
If after 6 monts you dont experience big change, go to a doctor for blood work and physical.