You might find affirmations weird and new age or whatever, the Truth is that we live in a society which surrounds us with Negative Thoughts, and tries to push us down at first occasion.
Reprogramming our Subconscious Mind should be seen like excercise for body, except it is for your mind.
We are made of body, mind and spirit. If your spirit is unhappy because you are neglecting each part of your human being, he or she will let you know for sure. Head aches and muscles tension are often a result of that pure spirit Unhappy manifestation.
Take a Good Care of your Self.