psychological drug withdrawals

My daughter was put on effexor about 6 months ago. 3 pills at 37.5 mg each. She is only 8 years old. She started having what I called “crazy episodes””. After consulting her psychiatrist(who even said he had no concern!)my husband and I decided it was in her best interest to take her off all of her meds. She gets stomach cramps, nausea, grumpy, cries..and it’s only been a week and a half. I have been told there are no withdrawal symptoms-I say crap! Nobody sees what happens either way and I find it hard to believe that nobody else has suffered from these symptoms. From what I’ve read the drugs she was on are pretty heavy duty! (concerta, effexor, seroquel, DDAVP) has anyone been through this? We need HELP!!