Anxiety ?? Having lot of anxiety, need advice to my anxiety cure?

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dear friends I have an anxiety issue, some time I feel depressed and anxious and this repeats many times a day. I tried to get out of it whenever I feel any such things but after some time it happens again. So, please help me, is it a sign of anxiety or really an anxiety. Before it I was very happy because I was having everything I wanted. I got worries from husband affair in his office with his colleague. This thing always keep bothering me and I could not get a stable mind. By thinking all time about my hubby affair different things comes to my mind. As I spent all time alone in my home these things attack me more. I think some time I got panic attacks. I seems I have no control over my mental health, it seems to me like everything is fake. So please requesting to tell me any such things which can calm down me from my unstable mind state. From such a terrible stage I am going through please help me to get out of it.