worried about symptoms, can anyone help me please?

Dennis, MD, are you a real physician?  Can you help me please?
I'm a 30 year old man.   About 3 months ago I started having chest pain which is upper central,  and 'heavy' in nature.   It doesn't get any worse with exercise.   I also started having problems keeping my heart rate below 100, I even had a rate of 160 in my sleep, I   was just wondering,  I don't know about the tachycardia,  but could swolen or enlarging lymph nodes in my chest (ones you can't feel by touch) be causing the chronic chest pain / heaviness sensation?   I have also had 3 bad viral colds since this all started,  and before this I had maybe  3 viral colds/infection in the last 5 YEARS.      

I had a normal chest xray, echocardiogram, all kind of labs including CBC, chemistry, liver, TSH, T4, cardiac enzymes, d-dimer,  none of these tests were revealing
Any ideas?   Could this be a swelling lymph node in my chest making me feel this sensation?

[Dennis MD]

Hi.
Just have some clarifications:
Aside from chest pain and tachycardia, do you have other symptoms?
How often do you experience these symptoms?
What precipitate these symptoms?
What is the result of your ECG?

An enlarging lymph node in the chest may cause some chest discomfort manifested as pain or heaviness.  Patients may also experience shortness of breath which can become progressive if there is continued enlargement of the lymph nodes with compression of vital organs.  An infection may cause lymph nodes to enlarge, but this enlargement usually resolves after treatment.

Have you been seen by a cardiologist?  Perhaps a Holter monitoring can be done and help in the diagnosis.  This is done to check whether there is paroxysmal rhythm abnormality to cause your symptoms.