Recently, I have been suffering from fatigue and found it hard to focus on my work, as I just want to sleep all the time. Also I always feel thirsty, so I drink lots and lots of water, which means I also have to urinate frequently.

The obvious symptoms of diabetes are excessive thirst and frequent urination, but an explicit diagnosis depends on fasting plasma glucose (FPG), which means you should stop eating (but continue to drink water) at least 8 to 10 hours before the test.

Recently, my chest experiences burning or squeezing pain, which keeps me awake all night. During the day, my chest feels tight and my breath is short, especially when I climb the stairs.

According to your description you are prone to get coronary disease, especially angina which is caused by high blood pressure or other coronary diseases. The cardiac function weakens after the age of 40, especially in males.

I am a teacher in a secondary school and work under high pressure. For the last six months I have been getting tired very easily although I haven’t done any exercise.

Based on your description, the symptoms of fatigue, dizziness, fear of cold, soreness of back and poor appetite correspond to chronic fatigue syndrome (CFS). In western medicine CFS could be caused by various factors like virus infection, immunological problems, neurological problem and mental illness, and has so far failed to give a specific reason for this illness.