I urge anyone suffering from Panic disorder/Anxiety, Depression or any other mental health disorder to ask your GP to refer you for an initial block of CBT, I have said in another thread it is a game changer.
In the meantime check out this site
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and look at the workbooks (PDFs), its a well known and respected site and the Panic Stations modules are particularly helpful especially the Exposure workbook as is Back from the Bluez. I assure you that if you are a long time sufferer they are written so they are easy to take in and be understood no matter how for down the road you are and because it is about you it will keep you reading but you have to get involved. There is info for a wide spectrum of Mental disorders including real core stuff like Perfectionism, Eating Disorders, Worry and Intolerance of Uncertainty and my favorite old nemesis, Health Anxiety.
As already mentioned by others on here, do get some help, don't be fobbed off and get active never underestimate the power of Endorphin's! Eat healthy, be mindful even if its just 10 minutes a day but above all make a start now and don't give up. There is always, always hope!