– What is the reason for pain and sadness and why do I suffer?
– Pain is you body saying that something is wrong and that you must do something to make it better if you can. Sadness makes you stay still and heal. Suffering is ignoring pain, hiding from it, not accepting that it is there, then the body will signal more pain until you listen to your body. This is a result of life itself. You must listen to your body and use your mind to heal as good as you can! You will try different things until it feels better.
Pleasure comes from health and doing good things.