Serdep is a trade name for Sertraline, an SSRI type antidepressant. Clearly the best thing to do in the situation you describe, is to consult your doctor for advice based on his detailed knowledge of you and your health and history.
You don't mention why you both agreed to change you from Cilift, a member of the same family of drugs.
I'm pleased to hear that you consulted your own doctor about reducing the drug dose. Though chest pain and other heart problems can occur with this and some related drugs, such symptoms must be evaluated in the context of a detailed examnation and assessment. I'm a bit worried that you "ended up in hospital" for such troubles, but you have said nothing here about what they found, what they said to you or advised. They must have made a diagnosis identifying the likely cause of the heart symptoms you were experiencing, and must have made a plan of how to deal with that. I would not want to guess about this or to distract you from the advice they must have given you, based on an examination and tests. I would expect that your own doctor must have been informed about the hospital findings, and will have advised you accordingly. It will surely be best to follow his advice.
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