Hi velisse64,
Devadog is right, you seem to have a lot of problems and need to be settled progressively. Most important is to get your facing reading correctly and also let us know when you move into this house and any renovation being carry out. You stated that the house is Period 7, so we can assume that it was build in that period.
I think the most important person to look at is your son and you did mentioned that he has some heart problem. Roylexind is right, he need fire. In his bazi chart there are too much water surrounding him and the fire element that is supporting him is under the attack of Water, which resulted him suffering from heart diseases. Although born in the summer season where fire is prosperous but unfortunately he is only 13 days into the Si fire and that period metal is experiencing growth. Water and Metal is not favourable to him. Present luck cycle Xin Mao or Metal Wood cycle, Wood came in to buffer the water from attacking the fire. That could help him a bit but still no good and he needs to strengthen his Fire using some feng shui.
Looking at your layout, it seem that his sleeping position is pointing to the bathroom's wall. I will suggest you shift the bed toward South (fire element) since he needs fire and water(bathroom) is no good for him. To further enhance his fire, you can place a Horse figurine (porcelain type - preferably red if not green or yellow) in his room at the micro South-West1 202.5 to 217.5 degrees. This could help to bring out the seasonal combination of Fire to enhance him.
As for the rest if you could provide us with a better picture, I believe Devadog with his rich experience or other expert members here could assist you further.
Good luck and god bless you.