Have a break, Have a cup of coffee

Friday, sometimes I drink coffee or tea. Why cannot drink during weekday? I cant get to sleep and felt so restless. I thought something is wrong with me. Why am I feeling like my heartbeat is beating faster? We were joking, if I gonna die soon, if I drink coffee then I can survive for one more day? Gooda. Do you think that coffee can save life? Maybe one day scientists say "Yeah, drink coffee, life can be saved!" Read from an article that stated facts about coffee:

• It can help fight pain (Maybe pain in the ass?). Sorry it is not. It helps to clear up a mild headache.
• It may protect against liver disease . 3 cups of coffee daily may reduce death rates from cirrhoisis of the liver
• It boosts mental fuction and alertness.
• It can boost physical performance. It trigger the muscles to burn fat rather then carbohydrates for energy. Other studies also appear to show that it can delay fatigue.
• It protects against type II diabetes. Taking decaffeinated coffee was linked to a slight higher risk of developing diabetes.

Side efffect of caffeine :

Temporary symptoms like nausea, termors, mood swings, restlessness, vertigo, headaches, sleep interruption and increased blood pressure. In high doses, it may lead to hyperventilation, panic attacks, migranes, vomiting, abdominal cramps and diarrhoea.

Long term may caused constipation. It irritates the gut and may contribute to prementrual bloating. For some people, caffeine can produce a sedative effect- the more coffee or tea you drink the sleeper you get.

I dont understand, it can help in a way and it can screw up in a way. So depends on your body. My body is the side effect type. Why like that?