Tom, a desert storm war veteran, has had nightmares and panic attacks for the past two and a half years. tom is most likely suffering from

I believe Tom is mot likely suffering from the post traumatic stress disorder.Post traumatic stress disorder is the mental health condition that is triggered by a terrifying event-either experiencing it or witnessing it. Symptoms may include flashbacks, nightmares and severe anxiety, as well as uncontrollable thoughts about the event. 

Explanation:

if intercalated discs are not present in the cardiac muscles then they might not contract properly and thus blood would not be pumped efficiently to other organs