A Heavy Heart or a Heavy Heart

My heart feels heavy today
Not like sadness or nostalgia
I mean it really feels heavy
As in there being a funny feeling
Maybe a not so very funny feeling
In my chest  . . .
No pain, just a heavy feeling
Hmm . . . it could be old age
Or simply nothing at all
Except for last night's meal
Or it could be a precursor
Of something really bad
But I don't know . . .