http://soul4ce.home.texas.net/meditation.htm
What do I do when I can't stop thinking? It is no easy feat to get the mind to quiet down. Think about how many thoughts race through your head a second! It is amazing! When you begin meditation, this is no different. You will have thoughts: pleasant, horrifying, arousing, angry, sweet, etc. All of these thoughts will try to tempt you into forgetting your breathing and to get you to stop relaxing. Your mind is powerful. The tip here is to be gentle with yourself at all times. Meditation is a time for peacefulness and a time to allow your mind a holiday. the mind will revolt but don't let that worry you, this is normal. The mind rarely gets a vacation so it is upset when you ask it to quiet down. Simply label each thought that passes through your head during meditation as "thinking". Just let the thought pass and focus on your breathing once more. The goal is to relax, not think and to find a center within yourself that has silence in it. The longer you practise, the easier you will find this silence, this peace within yourself.