Meditation is an excellent way to dissipate stress, as you have already learned. However, meditation by itself won’t stop the source of the stress, which is the thoughts that you are thinking.
So you get relaxed by meditating, but then you immediately go back to thinking the persistent thoughts that trigger the stress in the first place.
There are number of NLP (Neuro-Linguistic Programming) techniques that you can use to train your unconscious mind to use your persistent negative thoughts as triggers for positive, calming thoughts. These techniques are the real secret to getting your unconscious to provide the relaxation that you seek.
Here is a couple of articles that can help you to understand the process:
Anxiety, Its Causes And Cures