Hey, I'm so sorry that you are both going through all of this. You shouldn't feel guilty about seeking another opinion, this is your child. Get 50 opinions if that is what it takes and know that you have a whole team of support just a key board away. I know you said these usually happen at time have you kept a daily diary of food, meds, environmental stuff etc? Sometimes it makes it easier to identify what a trigger is if its in black and white.

You guys will get through this.

Phil 4:13 I can do all things through Christ who strengthens me.