is it normal to keep upping meds all the time

We are on Risperdal for my 8 yr old son's anger. He also takes tenex for his tics and attention and prozac for his anxiety. He is kind of an ABC diagnosis kid. He has Aspergers and tourettes and OCD. Most likely PANDAS because of his history of strep and behaviors, but we can't get him treatment for the underlying issue whish is his immune response that makes him get worse symptoms. He still gets shor tempered on the risperdal and tenex and prozac. We have upped all the amounts except the risperdal is still at 2 mg a day. He was much better in the beginning. He takes 3 mg of tenex, 2 mg of risperdal and 10 mg of prozac. He still is impulsive and gets into arguments. It seems to be an ongoing problem to adjust his meds. We see the psychaitrist monthly. He has been on other meds and they either made him worse or stopped working. We used Abilify to 15 mg and it stopped being effective. All stimulants made him hyper and agitated. I find this is a very time consuming difficult process. I am recording his daily behaviors. I take him to social groups and a psychologist. Any suggestions on how to keep my sanity? The rest of the house has suffered by his outburst. I have four kids and they get sick of his tantrums too. I want him to have a positive self esteem but it is hard to e nice when he is destroying his and my things! Also the school says he is great there which adds to the mystery! Why do his meds keep stopping working? They never last more then a month and then we have to up the doses again.