Hello thanks for asking from HCM You have complaints of panic without any reasons. Have fear of getting heart attack. You also have fear of heights, flying or living in tall building. Such complaints are persisting since last 3 years. All these symptoms are occurring due to anxiety disorder only. I would advise you to visit a psychiatrist for solution of these problems. If ignored at this state the symptoms may cause significant impairment in day to day functioning. Treatment of anxiety spectrum disorders involve both medicinal and psychological treatment. Medicinal treatment consists of SSRIs like Fluoxetine, Paroxetine etc. These medicines help to reduce anxiety by improving serotonin transmission in brain. Medicines like Benzodiazepines clonazepam, etizolam etc help to reduce the symptoms of anxiety. Non medicinal treatment like Behaviour therapy, Relaxation Exercises, Yoga etc can also prove useful. These methods have efficacy comparable to medicinal treatment. Consult a psychiatrist for prescription of medicines and treatment. Thanks, hope this helps you.