Help getting off of 12.5 mg.

Hi everyone, I have been taking quetiapine for insomnia for about 15 years. My dose has fluctuated between 25 mg. and 75 mg., which I would take for migraines. I was pretty consistent with 50 mg. for a few years. About 3 years ago, I dropped from 2x25 mg. pills to 1.5x25, 1.25x25, 1x25, .75x25, to where I am now, .50x25, which is half of a 25 mg. tablet, or 12.5 mg. I have a lot of life stressors going on at the moment so a few days here and there I went back up to a whole 25 mg. tablet for a few days, then 3/4 of a 25 mg. tablet, now I'm back at 1/2 again. I started a water taper a couple of weeks ago of the 1/2 tablet (12.5 mg.), taking out 1 milliliter for 3 days, 2 mls. for 3 days, 3 mls. for 3 days, etc. I'm sorry this is so convoluted, but do you think this will be okay to do it this way? I just don't know what to do, there are so many complications, not to mention I took my last dose of Klonopin 4 years ago, and I'm not sure if my nervous system is still protracted from that. Please, please, can someone help me figure this out, or did anyone do this kind of water taper successfully? Thank you so much.