What could chest pain and exhaustion be?

[kshim]

I've been to doctors for chest pain...sort of a squeezy achy feeling under my left breast deep inside. At times it radiates to my neck, back or center of chest. With exercise it gets worse and I get winded with simple around the house chores or walking the dog. This has come on me gradually after my blood pressure spiked (never had issues with bp or any of this stuff before).  We have done all heart related tests... ekg, chest xray, CAT scan, stress test, echocardiogram, blood work etc....  all normal...totally normal.   I am not anxious...I wake up with this too ... it never ever goes away. They gave me blood pressure meds which helped my blood pressure, they have given me anti inflammatory meds which have done nothing (thinking chest cartilage maybe was inflamed though none of tests show it).
I'm at my wits end.  One person suggest catherization to look at small arteries leading to heart that wouldn't show up in these tests but I'm afraid to ask the cardiologist about that because he already saw me and didn't mention it or think it was necessary to go that route.  But I'm getting worse and I have no answers and I don't know what to do.