Crystals that help with anxiety do so in a few ways. They may be grounding and remove negative emotions, feelings, thoughts, and energy. They may be calming and help sooth your mind and nerves. They may be loving and fill you with warmth and feelings of love. They may unlock repressed feelings so you can really deal with what is causing the anxiety.
The grounding, calming, and loving crystals can be carried with you to affect you all day long. The ones that worked on your repressed emotions are better to be used at home while meditating so you are not surprised when you are out and about.
Black tourmaline for grounding, Angelite for calming, Rose Quartz for loving, and Labradorite for emotional healing will serve anyone with anxiety very well.