It is not a rule that either you have to suffer from Depression or from Serotonin Syndrome.
With currently available treatments you can live a happy and meaningful life.
Lot of clarifications in your case are needed. For example - nature of your symptoms, medications prescribed, their dosage and optimization.
Clarification about symptoms that were labelled as Serotonin Syndrome.
Next Steps
Plan a physical consultation preferably so that your concerns can be understood in detail.
Health Tips
These medications ( SSRIs, TCAs and SNRIs) are not addictive just like antihypertensives, oral hypoglycaemics and
thyroid medications are not addictive.
These are essential medicines and many a times long term treatment is needed.