I'm assuming that as you have had various medications, that you have also received or been offered counselling? Self harmers have many reasons for doing so, ranging from it being as a result of abuse, a release of sexual tensions, bullying, bereavement, as a "fashion statement" and also as a means of obtaining ownership/control of one's own body/life.
You need to understand what triggered this cycle for you, and find help to deal with that - medications are only going to dull your perceptions - like using a sticking plaster to "fix" an amputation, if you'll pardon the analogy.
Are you or were you part of a subculture which regarded this as normal, or even desirable? If so, have your friends moved on or are they still harming? If the latter you could be subconsciously continuing to do something which you would otherwise have outgrown, as an attempt to remain within a comfort zone - to fit in.
I have been there in that self harming was the only way I could take control of events in my life. No matter how much other people were hurting me, both physically and emotionally, I could go one better - and this empowered me. A difficult concept to get one's head around, and especially as this was when the term/act was virtually unknown. Nowadays it's different.
Fortunately, I have taken all the crap out of my life and disposed of the people who were controlling me. Maybe this is where you are coming from? Whatever the reasons, and they are complex, with no two people's being the same, there are ways out of this cycle. You have recognised the fact that your harming appears to have become habituated, and this is a step in the right direction in itself.
Why not PM Maybell? I do hope you are helped, and recover your own will as quickly as possible.
Tasx