New onset of unexplained problems

[Gumbo804]

Hello!   35 year old with an clean medical history, until 4 months ago.  I had been standing up for about 30-45 mins and what felt like a "rabbit" skipping  in my chest and the I almost blacked out with a headrush,  

Before this indicent,  I admit that I have gone from daily exercise and eating well,  to basically being a couch potato, smoking a pack a day, and eating a fairly bad diet.  In fact a few hours prior to the incident I'd eaten chicken fingers and a bunch of Oreo cookies like some kind of man-pig.  And before it happened my chest felt "tired" all morning.  

But thing is, 1 month ago, I began feeling extremely bad with a chronic chest pressure (not worse with exercise),   random high pulse that sends me into near fainting spells,  and at rest  my average BP has gone from borderline hypertension to 95/55 and pulse is usally below 60, sometimes down to 50 with dizziness.    I feel like I have this "energy" floating in my abdomen and chest which is waiting to set off my tachycardia at the least upset,  other wise I'm lethargic,  chest feels heavy, actually feels better with a deep breath and, feels worse when laying on the left side (heart flutters into left shoulder laying on left side), so I mostly sleep on my right side.  

Heart feels inexplicably "weak",  all my symptoms "wax and wane" in intensity but dont go away
I also noticed that when I yelled my chest hurt much worse, but its not worse with exercise.
I weigh 235 pounds and am 6 feet tall, so im not that big, but a little overweight nevertheless.  I did try exercising on the stationary bike for the first time in months, with no major shortness of breath, but that night I was having vertigo when I laid down to go to bed  (I've noticed this alot on the nights or next night I do cardio exercise even before symptoms began)

I was seen in the ER and was given the Usual labs, echo and EKG.  Follow up with my doc, he said let's just watch and wait, he thinks I'm okay BUT I FEEL VERY BAD, HELP

[Cleveland Clinic]

It sound like you quite deconditioned and probably need to change your lifestyle a bit before you start feeling better.  Statistically speaking, there should be nothing wrong with your heart, but given that you smoke and are quite overweight, it is not unlikely that you could suffer from something such as coronary artery disease or cardiomyopathy.  I think that getting an echocardiogram and maybe even a stress test would be a good starting point.  You could also consider wearing an event monitor to try to correlate your symptoms with any abnormal heart rhythm.  Of course eating well and exercising routinely, losing weight, etc are will also help.  

[Gumbo804]

I should also add that if I try to take a deep breath and hold it, I start to pass out almost immediately...I cannot hold my breath at all anymore, with going into a headrush and fainting  (and, when I do get these near fainting, and start breathing again, I feel very nauseated as my heart begins pounding away in my chest and abdomen again)