I have been practicing mindfulness meditation for the last 14 months - 30 minutes, everyday and I have to say that it has been virtually the most important skill that I have picked up. Because it's essentailly that - a skill. I was very stressed and the anxiety started to affect virtually every aspect of my life. My family wanted me to seek professional help (take pills), but I decided to try to take care of it mysel…
One thing I recommend is persevering through the "difficult" meditations. It's about being alert and aware, not about being calm and relaxed. Recognize the "distracting" thoughts and let them go each time they arise, don't continue the conversation with those thoughts. Go back to your breathing and just sitting there. Some days those distracting thoughts come more than others, even after 10 years of meditating.
When I met Thich Nhat Hanh in 2005 he said these difficult meditations can be the most rewarding.