Hi. I think one of the important things to remember is that even with medications, symptoms will still cycle from time to time. My daughter usually does better with a level of 1.1 - 1.2. Her kidneys acan handle it and it helps keep her moods stable.
I know it's frustrating but in general, this is a difficult time of year for mood disorders. If there's a lot of bad weather or lack of sunlight it can trigger all kinds of mood swings.
How long has he been on the Strattera? Are they using the Seroquel as a rescue medication or at a maintenance dose?
Try to keep the faith. You can get through this.
Peaceful