This forum is for questions and support regarding neurology issues such as:
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ALS,
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Your symptoms indeed sound like serotonin syndrome.
You were on drugs which cause concentration of serotonin to rise.
In mild cases, removal of drug for more than 72 hours resolves the symptomatology.
The symptoms in your case do not appear to be mild.
I think you need to contact your psychiatrist back and get admitted in hospital for day or two till symptoms are subsided.
Benzodiazepines can be started for myoclonus.
If symptoms still persists cyproheptadine, propranolol, or methysergide can be started then.
Once admitted to hospital immediate supportive care as necessary (e.g., therapy for hypertension, tachycardia, hyperthermia, respiratory distress) can be provided.
Keep me informed about your symptom progression.
Bye.