Hi yesterday I had eaten chicken with rice and drank a mountain dew. I went out and was falling asleep so decided to order some coffee. I drank this coffee pretty fast I only frank maybe a little under one cup. I then smoked marijuana and felt like my heart was going to beat out of my chest. I thought I was going to faint or have a heart attack or something. I drank water which made me fell better. I knew where I was I could speak but I felt like it had been the coffee that did it. I don t usally drink coffee but when I do this has never happened. It could have been the mix of all three things (coffee, soda, and marijuana) but the next day (3/4/14) even though I felt better I keep getting small chest pains here and there. I took tums thinking it s heartburn (which Ive never had before until now) but having a pain in my chest still comes up here and there. It lasts for about 2 minutes then goes away and will come back again unexpectedly. Whats happening to me? What should I do?