May he recover soon. My father recently had a heart attack so I know how painful the whole thing is not only for the person who's facing it but also for his kids and family. Glad he is recovering quickly. Since I recently went through the whole process, if you need any information related to this, let me know and i'll try to tell you what we experienced and how we dealt with it.
Was it a heart attack or was it only a minor pain? I am confused because from what you have descriped in your original post, it doesn't sounds like a heart attack (which would be THE BEST) but then you said he has been admitted to CCU, so is he there only to keep a close check? But that's also possible in ER of any given reputable hospital. So I am kinda confused and well add the fact that I haven't slept all day, all night, I am feeling more dumb than I usually am