You are definitely not alone I to have been passing out and having seizures when I went to my doctor he said I was having partial seizures which scared me because seizures does not run in our family. I have been on three different types of of medications none of them worked (go figure) I asked my doctor could mirena have caused this he said it may may be a possibility but he doubts it. My neurologist (jackass) has done nothing to really help accept just putting me medication. I had one of these blackouts /seizures while driving and total loss my car it was truly heartbreaking. My episodes occur every 3-4 days and they seem to be getting less aggressive. I pray that I get my body & brain back because this really hurts I hope you all get better and make it through this.