Hi, I am a 31 old female with 158 cm height and 59 kg weight. My problem is that since 3-4 days ago I feel my heart is heavy or ...I cannot really describe it.  I should put my hand on my chest to feel better. I searched about it and most people says that this could be because of stress. I am a phd student so I am some how under pressure but my work didnt change since last week, so why I have this problem now. I am wondering what can be the cause and what should I do that.  Thank you very much.
It can simply be due to acidity problem, but you should get EKG done to rule out heart problems. Acidity problems are frequently exacerbated by stress. You can try antacid for the same.