I am sorry to hear you are in so much distress. Whilst rare it's not unheard of fort someone to experience sever hormonal reactions to birth control. I think you have followed the time line and made a reasonable connection. Removing the implant may help considerably, but be sure not to dismissing other possibilities. Did u want to go on the implant in the first place. Was there some other things going on that may have triggered this. Maybe talk it through with a professional.
Lathe best, I hope that in a few weeks you will be feeling much more your old self.