Hey thornsharp 
Sounds like location has nothing to do with this attachment (if they foud you out of FL). They've latched onto YOU. I'm curious if your friend is still being tormented, as well? Unfortunately, this is not something that burning a bit of sage and sprinkling a salt circle around yourself will help with (although, the salt circle might be worth a shot).
I've got a couple of questions for you:
1) Is your friend an "abductee"? (or do either of you suspect these negative humanoids are "alien" in nature?)
2) Is this more of a poltergeist kind of thing? In which case, I've gotta ask if either of you accidentally "invited" these things through some kind of ritual or some seemingly harmless game, like a Ouija board?
3) Did you tell these dark entities to leave your friend alone and mess with you instead?
I agree with StarCat and Lono that you must remain fearless in knowing that you are stronger. You're the one who's incarnate, for kripes sake. If I were you, I would confront them and say out loud, (but in a strong, clear, voice, devoid of fear, and you have to REALLY MEAN IT)
"LEAVE. YOU HAVE NO RIGHT, AND YOU ARE NOT WELCOME HERE. GO BACK TO THE PLACE WHENCE YOU CAME, AND NEVER COME TO ME AGAIN. LEAVE, IN THE NAME OF JESUS CHRIST" ...(if you're a Christian, that is... otherwise, say the name of who/what you believe in most)
Repeat, until you actually feel the truth of what you're saying vibrating through you and pushing back these negative entities. (believe it or not, that actually works in a lot of cases)
Now, if these things are "aliens", the above speech might only give these dark effers a chuckle, and it won't stop them.... In which case, I'd still recommend a confrontation. Tell them that they must state their intentions, and that you, under NO circumstances, will allow them to keep tormenting you in such a way. Tell them that as an incarnate spirit of light on the earth plane, you are a protected human who knows your rights, and they are violating those rights. Tell them that if they do not stop tormenting you, you will inform The Council, and they will be delt with. (if nothing else, this may give them a moment's pause, because they know damn well that they're not supposed to be doing what they're doing to you)
I hope this unconventional approach helps you out a bit. I wish you all the best and plenty of strength. I know it's hard to do this with how you're feeling right now, but remember that these things HATE laughter, too. So try and surround yourself with things that make you happy and laugh as much as possible, because THAT will be your best first defense. (besides, laughter's good medicine) 
Good Luck!!!
~Pinky
"Sometimes I wonder whether the world is being run by smart people who are putting us on, or by imbeciles who really mean it." ~ Mark Twain