Harley, welcome to Psych Central (PC). Sorry to hear you are contemplating stopping the medicine that is designed by your psychiatrist (pdoc) to prevent slipping back into the darkness you came out of. It seems like your pdoc is responsive to changing the amounts of medicines you take like the Seroquel.
You may be aware that the medicines take time to kick in and help you since you found that in your last major incident. The reverse happens when you stop them. They diminish over time and symptoms may appear and then one day there might be that deep darkness again. That could mean losing your home, your fiance and your freedom if you have to be hospitalized.

That sounds like self destructive behavior. You know or know now that by stopping the meds you will eventually get back to a similar state as before. That does not sound like wisdom, it sounds like tempting fate or simply giving in to self destructive tendencies.

That brings up an idea about trying to talk to the pdoc and see if they could adjust the amounts so the shaking of the hands stops or try a different med. This plan has the advantage of working with a trained professional that can help guide you.

Your theorizing about why you want to stop the meds is inconsequential. A friend tried what you are doing and they described it as they were driving toward a cliff and just did not turn away. They went over that cliff and lost a lot in life.

You still have time to turn away from the cliff. Talk to your pdoc about resuming medication in a safe way. You have yourself in your care. Just like having a baby in the car, be very careful.

Here is an article that might be of interest
Discontinuing Psychiatric Medications: What You Need to Know | Psych Central