Still a mystery

It's Saturday morning and Grant had a rough night. He was constantly grunting (gasping for air) and flailing his arms and legs. Any time we put the bottle in his mouth he gagged. We tube fed him throughout the night and he kept it all down. We talked to the doctors several times throughout the day yesterday. Our cardiologist is amazing and kept calling us at home to check on us. He kept apologizing that they can't figure out what is wrong with Grant and recognized how frustrated we must be as parents. He said he will not rest until Grant is better. He rescheduled the heart cath for Wednesday in hopes that any virus Grant has will be gone by then. However, he said if he continues this behavior we could bring him in on Monday and they'd probably do it then. The danger in letting Grant continue to grunt and struggle to get air is that at some point his heart may just give up from working so hard. But, at the same time they said that they won't do anything for him at the hospital except watch him if we bring him in over the weekend. So, they advised us to watch him very closely at home (thank you Jim for taking the 9pm-5am shift last night)and bring him in if he gets worse. This is all so confusing and not clear cut. Please pray for wisdom for Jim and me to know what to do.