I am afraid I will have a panic attack on the plane...?

Hi there, I have always had mild anxiety and was diagnosed with it a few years ago and was told that I should live with it and nothing is going to happen to me, this was told to me by a doctor in the emergancy room. Just about two years ago I have had the most awful attacks ever, but am still able to go to work each day, focus, get things done. Every day I have a panic attack and am wondering if it could be peri menopause that is causing such anxiety. I am determined to not allow this to stop me from enjoying my anniversary trip with my Husband to the Virgin Islands, however, I have not flown in three years and was perfectly fine, but now even getting on the subway alone makes me have an attack. I dont get it. Do you think I wil be ok on the plane for four and a half hours? What can I do, I am worrying about it now and the trip is four months from now. Thanks!