I am really sorry to see what happened to you. It is clear that you are a genuine poster and someone somehow started posting on your behalf.
It is impossible to know who did this, or what their motive was. The question is how did they get your posting password? Did you use a public computer? Has your compter been hacked or is it running a key-logger? Did you lose a phone or iPad? Did you enter your posting key into an app that claimed to be part of steemit?
I see that in one of the recent replies you have been invited into a discord chat to resolve the issue. But you must first remove all the offending comments. Hurry-up. Some of them are already 6 days old. Once they are 7 days old it is too late to edit.
Good luck! I hope you get your reputation back.