What could cause symptoms that feel like a heart attack?

[MissVacant]

My boyfriend is 26 years old, and for the past year he has been experiencing what to him feels like a heart attack. When it's at it's worse, his left arm tenses up, and he receives a tight feeling in his chest. His other symptoms that he experiences daily include nausea, headaches, muscle cramping, tingling feeling in hands and feet, and sometimes blurred vision. He has been to a physician on multiple occasions, in which they chalk it up to anxiety or migraines. He has tried both anxiety and migraine medication, and they both seem to worsen the symptoms. There has also been occasions where I have taken him to the ER, in which they have taken blood work, EKG, and even an X-ray that determined there was nothing going on with his heart. He has seen both a neurologist and a cardiologist, Had two MRIs and never received any information. He has tried a chiropractor as well, thinking it may have been something along those lines. Still having symptoms.
On one occasion, we even started him on a list of vitamins thinking it was a deficiency. He is a vegetarian, but we eat a lot of vegetables. He drinks plenty of water. As far as other details about him, he avoids alcohol, and does not smoke. He is not overweight, but only moderately active. His job is a normal 9-5, and the stress level is moderate.

Does anyone have any suggestions of what this might be or what else we can try?

[JohnnyRocket244]

All of those symptoms could be caused by a rarely diagnosed condition called Nutcracker Syndrome (Left Renal Vein Compression). I have a friend that has this condition as well as another similar one that I have called May-Thurner Syndrome (Left Iliac Vein Compression). I would recommend joining a Nutcracker Syndrome Group in Facebook. Read some of their stories, many are very similar to the problems your boyfriend is having. Vascular Surgeons are the kind of doctors that deal with these condtions. Hope this helps as I know most doctors are unfamiliar with these Vascular Compression Syndromes.