pulsating chest pain

[a6d6]

I have this deep pulsating chest discomfort in the upper central area below the throat,  it pulsates when my pulse gets up, when i have tachycardia due to any variety of emotions (anger, anxiety),  and when I'm at rest,  it just feels like a dull heavy pressure, I also sometimes wake up at night tachycardic and short of breath.   I've also had lightheadedness and near syncope when my pulse gets tachycardic too.   I don't understand this, I'm not under any stress or anything,  I just mean normal excitement that would get anybody's pulse going....sexual anticipation,  etc.   Also I've been getting breathless or winded or just feel like I don't have the energy to talk at times such as on the phone, etc.   I've also been expelling some yellow mucus here and there, but I don't have a cough.   I'd like to know, what tests are indicated?  My echo was normal, as was the regular chest Xray.    
chest CT?  bronchoscopy?  heart cath?   I'm 35 years old and an ex smoker...slightly overweight not too bad.

[Cleveland Clinic]

It sounds as if you have deep chest pressure, underneath your throat. This is not a common complaint of cardiac ischemia, but may mean you have an aneurysm or dilatation of one of the major arteries in the chest and neck. For this I would order a CT of the chest. And if you have some palpitations then I would order a Holter  monitor and see what the cause of these symptoms is related to any arrhythmia you may have.
The lightheadedness with a deep breath I am not sure I can explain. Has anyone measured your Oxygen saturation? t may be that you have a lung problem, ant that this has caused you to have decreased oxygen exchange in the lungs, whcih can then cause breathlessness, and dizziness.

[a6d6]

I also get lightheaded very easy by taking a deep breath, and start to pass out almost right away if I hold a deep breath