I have been having chest pains for two days now. I feel like I have massive pressure in my chest. Should I go to the emergency room?

Panic. No. There would be little they would do for you there other than to tell you that you are having a panic attack. I would recommend getting in to see your family doctor or working on your breathing and coming to terms with what is causing your body to experience anxiety this way.
Yes. In general i would recommend that anyone with severe chest pain go to the emergency room to be properly evaluated. Severe chest pain could be related to a life-threatening condition such as pulmonary embolism or a heart condition, and it's best not to delay evaluation.