Suggest Treatment For Anxiety

Hello. I am 19 and I have fairly bad anxiety. What I mean is, I have very bad anxiety. I have for the past year or two. I am very overweight, and my anxiety attacks are mainly illness phobia related ones. I am under alot of stress the last week, I have applied for an apartment that I am desperate to have. About an hour ago, I had a heart thumb. Skipped a beat. Etc. It frightened me, so I took a deep breath and it felt strange. This caused me to have an anxiety attack, and I had mild chest pain on the left bottom side and i got nervous and a little sick to my stomach. I believe most of these were symptoms from the following anxiety. I had an ECG in March because I went to the ER with arm pain. They said everything was fine and it was probably a muscle/nerve issue. I know, logically, that I'm fine. My doctor has told me that the heart does this to 'catch up' with itself. I don't want to go to the ER, I love 25 minutes away from the nearest hospital. The pain is gone, I am just still a little nervous. The only thing still bothering me is that I get a gassy rumbly feeling in my upper abdomen, sort of below my heart. I passed gas a few seconds later. Could that be gas, so close to my chest and heart?