Ask a Psychiatrist and Get Answers to Mental Health Questions ASAP
I would suggest that you seek immediate medical attention. It sounds like you are having some kind of psychological/neurological issue that is negatively affecting you both emotionally and physically (the increased heart rate in itself is worrisome). It is important that, when you see an emergency room doctor, that you tell him/her that these problems are so distressing to you that you are thinking of suicide.
I believe that you can get the help you need to feel better but feel strongly that you will need medical attention to do this.