1. curtain on the door of room or rest room.
OR
2. Mirror to reflect back.
3. But most important is the arrangement of your bed position, which is also your sleeping position.
The above is just simple minimizing of any bad effect of the rest room door. Mainly. FengShui is still depending on the detail and overall data of the residential.
Since you bought in on year 2006 and till now (assuming you are living here) has no any bad effect, which can also tell that the door of the rest room is not affecting the residential.
For your info only.