Serotonin Syndrome?

Hello, Parkinsons Dx 2021, DBS 2024.
After recent stomach stricture surgery, placed in recovery I was having great trouble waking up. Heart rate dropping as well as O2. I was eventually comatose. Strangely I could hear everything going on with Rapid Response Team in ICU, once my nurse realized I was in a bad way. I heard Dr's giving orders for O2 & IV meds & felt what seemed like every medical person working that day giving me long hard & painful Sternal rubs! But I couldn't respond! I kept thinking im here don't use the crash cart as they were talking about. I heard my heartbeat Bradycardia was falling into the 40s then 30s. My O2 dropped to 50s. All along screaming in my head Im here! A nurse standing next to my head saw my lips move & me barely say Im here!! She yelled "she's just whispered Shes here"
I then lost consciousness but they eventually brought me out of it. They said i had Serotonin Toxicity, common they said in Parkinsons patients!? The fentanal, Zofran, tramadol, plus carbadopa/levo and setraline that I was given was too much SSI uptake for my body to handle! Very scary having 'locked in episode' I pray never again! Anyone experience this Serotonin toxicity issue with your Parkinsons? Im hoping not to ever have surgery again because so many pain & anesthesia drugs buildup Serotonin and cause these terrifying potential deadly toxicities!