Psych drugs are somewhat unpredictable, even in the 21st century. The drugs now aren't all that much different from the the drugs 50 years ago, just more tolerable.

Do you need to increase your dosage? If you have poorly controlled or uncontrolled hallucinations, maybe a different antipsychotic? Some people do take 2 antipsychotics at the same time. I have low dose (2mgs) risperdal I rarely take on top of ongoing Abilify. Works better than increasing the Abilify, oddly enough.

One thing that I thought is that since you're on lithium, maybe its the lithium+seroquel combination that's resulting in these weird effects?

Hope you and your prescriber can work something out.