This is a complex case with multiple neurological and autonomic symptoms following serotonin syndrome. The internal shaking, akathisia, nerve hypersensitivity, and intolerance to medications all point towards a dysautonomia or central sensitization syndrome that requires specialist evaluation. A neurologist with experience in dysautonomia or a clinical pharmacologist for medication intolerance assessment would be the most appropriate specialists.
Next Steps
Seek care at a tertiary hospital with a neurology department that handles dysautonomia and post-drug syndrome cases. Please consult me directly on Practo for a detailed evaluation.