Antipsychotic and antidepressants made legs really weak and sore. Also have dry tongue jaw stiffness. Is it because neurotransmitter levels. I stopped?

Side effects of meds. The symptoms you describe could be side effects from the medications you are taking. Talk with your Doctor as he can adjust your medication or add a side effect medication if lowering or changing it, is not appropriate. It is more related to blocking other receptors that are present in areas not intended to be treated, (that is why is called side effect!).