Ben and Chowna have great advice. I can add that it has been said that without a good meditation teacher with you, and without a clinician or therapist involved, some meditation practices can even aggravate anxiety. It's not that meditation is harmful in any way, but if you don't have a good teacher to instruct and guide, meditation can amplify anxious thoughts and feelings, and when these arise, it's important to have a strategy for dealing with them in the meditative process. The analogy might be that some people get very sleepy in meditation, and need instruction on how not to veer into snoozing on the cushion and toppling over.
It's just points of strategy that a good teacher can help with. I was reading an article yesterday about the intersection of Buddhist psychology with western cognitive behavioral therapy and other modalities. One point of the article is that good clinical approaches to anxiety, in tandem with good meditation approaches to anxiety, bring the best results. The two can work together to elevate the enormous benefits of meditation. Eventually, the clinical interventions become unnecessary, leaving the meditation, trained and properly cultivated, as the practice on the path forward.