Frednick2002,
Thanks for the post.
Sorry to read of your father's ordeal.
Unfortunately, lab tests are really only useful when examined in proper context -- the implication of a given value depends on the patient from which it is drawn. A low hemoglobin count is often expected in a young female who has just delivered a baby, but is concerning in someone like your father.
Many, many conditions can cause fatigue in the elderly. I see 2 potential causes for your father's fatigue based on the information provided. One potential cause is the slow heart rate, which might be worsened by the beta-blocker. A second potential cause is the low hemoglobin level. I need to stress to you that numerous other possibilities exist.
I would strongly encourage you to take your father to see a reputable internist, not a specialist, at a large medical center. Be sure to take all possible records with you.
Hope that helps.