What Causes Body Tremors And Muscle Stiffness While On Seroquel?

Question: I will start out that I have been an insulin dependant diabetic since the age of two and am now 31. I was diagnosed with mild neuropathy about 4 years ago. I take seroquel and Wellbutrin along with xannax for anxiety, depression, and bipolar disorder. About two years ago (while only on xannax to sleep at night,) I noticed that I shake, or tremor with simple tasks. It really became apparent whilst trying to do simple tasks while in a more relaxed state, such as calming at night. It became more embarrassing when others began to notice and ask why I'm shaking. When I physically try to maneuver it is less noticeable. But when I try
To settle and relax at night, I find that my pointer finger and thumb run together as if I'm polishing a coin. My upper lip purses on its own as my bottom jaw rotates as a horse eating hay. It's annoying because it gets worse as I relax and I have no control over it. It has proven to be a daunting task just to write or fill out paperwork as my handwriting is getting very small. I don't know if it's related but I've also been experiencing muscle stiffness almost like when I was younger and had ketones but I keep my blood sugar in control and my HA1C stays around 8.