From what I can see there is a lot of doubt and fear. One must have faith and believe. Rise up over those thoughts you are getting and if you have to say a verse outloud. We do not fight a battle of flesh & blood but a spiritual war. The devil is pissed that you are saved-he wants you back. Oh well you belong to God now. As for your fear i used to say a verse outloud which helped me a lot "For God has not given us a spirit of fear but one of power, love and of sound mind". Once I said it I knew it was true and the fear left. Ask Jesus for help He will help you.
Hope this helps a little bit at least.