hello doctor. I am a 20 year old male with a strange condition and its a bit descriptive. Your help will be very valuable to me. So let me start. I was a smoker once. I used to smoke Marijuana from about July 2013 and left smoking after February 2014. I also smoked cigaretes from about December 2013 to February 2014. The reason I quit smoking was because I had a very bad hangover after smoking marijuana. When I was high I was thinking if it could kill me and all of a sudden I thought I am going to die and my heartbeat raced and I was full of fear, It might have been a panic attack but I thought it was a heart attack and I became restless and started running and splashing my face with water, I was terrified. after few hours I was normal but my fear remained for about 2 days and after that i became completely normal. Few weeks later(in march 15 approximately) at night I had a slightly sharp pain in my upper left abdomen and I thought it was a heart attack and I had another episode of that panic but this time it lasted only for a minute(may be even less and might have been due to gas) but after this episode I got very depressed thinking that I might have developed a heart condition or lung problem or even stomach cancer. I used to remain depressed all day and was also frightened at the same time for about a week. I used to search the internet about everything that could have caused it. After a week my paranoia reduced but was not completely gone. I had my exams that week and after the exams were over my paranoia reduced but was still there to cause me stress. after few months during my next exams my stress returned with a vengeance and I used to feel headache and inactive all day and I thought that I still might have some disease related to smoking and after the exams were over the symptoms were all gone. It has been almost 5 months now since that panic episode. but whenever I get mild chest pain mainly due to gas or mild heartburn I get anxious. Is there a way out? I know that I have no serious condition cause I didn t get any check-up after that episode and in these few months more symptoms should have appeared. Your help will be highly appreciated. Thank You.