How to taper and stop meds. Started.

I'm suffering from depression from 4 years. After taking Nexito,flutee, lithium, amisulpridie, desvenlafaxine, clonazapem, methylphenidate. I'm not recovering completely. I don't feel much difference, I have learnt to manage it. Therapy is useless. I'm finally on Nexito 20mg. Earlier I didn't have side effects but now I have to take pantocid everyday to reduce gastric symptoms. I'm unable to enjoy any food. I don't have sex drive. I want to stop it but even at 15mg after 10 days my condition becomes very bad that it becomes hard to do anything. I want to either be on some medicine which will not have side effects or stop it completely. Is it possible that with time these symptoms will disappear or one has to take meds for lifetime once they have started.