Hi Wednesday:
The JW way of teaching and beliefs definately foster a sense of fear & paranoia about the spirit world. Being raised with that all of your life it is deeply ingrained. I personally have never experienced anything like what you explained (although I do suffer sleep paralysis a lot and was relieved to find out what it was). However - I was so scared of demons all my JW life - it was terrible. I have since come to a new understanding and theory about some of this so here's my two cents:
Our mind is a VERY powerful tool - we have not even begun to tap into it's treasures and strengths. When Jesus said "whatever you ask of me, if you truly believe you have received it you will" - I believe he was hinting at this very subject. He knew the power that we have and do not yet know how to use. Take for example those soldiers during war time that were given a sugar pill, yet told it was pain killers. In many cases their pain left. And instances were individuals have been able to perform incredible acts of strength such as lifting cars - I even seen a video of a man who lifted a helicopter up to save a traped pilot - just incredible.
So here's what I would suggest. Recognize that it could be two possibilities (1) demons - yea, I do believe they exist but am not convinced that they attack as prevelantly or the way as the JW's thought; or (2) you may be creating these with your mind. Not that you're crazy or schizo or anything like that - just that you may be able to tap into some of that power that we all have. And being raised a JW that power was molded to a very dark & scary form. So I would follow two courses of action at the same time. Talk to a counselor to work through what could be causing these (unresolved fears or feelings), and pray to Jesus about it. Pray to him and ask him to stop the attacks - to send an angel to stand by your side and protect you.
The truth is - if it's demons, the Lord is stronger than they are and will come to your side to rescue you if you only ask for his help and, very importantly, ACCEPT his help. If it's not demons, and you are able to CONVINCE yourself that it won't occur again - you then have the power to stop it.
I hope this helps - I encourage you to pray to God, or the Lord. I find it much easier now to pray to "Lord" rather than "Jehovah" because the name Jehovah just brings up too many bad feelings & memories.
Ok............now I'm bracing myself for all the food throwing from the non-believing heathens (ha ha ha) Just kidding - you know I love ya'all because we all have too much in common and we're all survivors.