Heart disease is not completely ruled out.
Angiogram is the only test that can do that.
chest pain can also be from
spasm of the esophagus
Inflammation of the heart [needs echo cardiogram]
If it is only a slightly low count, likely it is within normal ranges and lab error ranges.
If it is truly low, it might often have to be followed, since everything else is normal.
Any viral infection can slightly lower the count.
Autoimmune disease can to it, but then it would drop.
Medications can do it.
Hepatitis, HIV and some other infections
toxic chemical exposure
other autoimmune diseases like lupus
And other causes.
IT is an extensive list, that is if they keep dropping.
If you are otherwise healthy, not likely to be leukemia, lymphoma, etc. and not with normal blood tests.
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