Am I being punished by Jehovah, or is the devil out to get me...I dont know anymore what to do...
Sorry to hear about your Mother but she is the one who is sick, so no....you aren't being punished. To think that your words have that much power over the God of the universe (if he exists), must be a heavy burden for you to bear. I'm sure on some level you realize that it's a bit egocentric or narcissistic to believe that God (if he exists) would punish your mother because of something you said or did.
If the devil (if he exists) were out to get you, he would likely make positive things happen for you rather than negative things that might send you running back to the JW's.
Charles Manson is a mass murderer and yet he is in his high 80's and has been alive and well in prison for decades living off the taxpayers while my wonderful father died not taking a blood transfusion supposedly out of obedience to Jehovah, which proves to me there is no God.
It's time to focus your energy on helping your mother now, rather than wasting it on these superstitious notions about God and the Devil that were planted in your mind by religious fanatics.