Hi,
The truth is what you're experiencing is spiritual warfare. Once a person gives their life to Jesus Christ, the battle for your soul begins. Satan hates mankind because unlike us, he will never get a second chance to enter the Kingdom of God. Misery needs company. I went through that when I decided to give my life back to Jesus, it was the hardest 4months of my life, I felt like giving up, that's what satan wants us to do, but stick with Jesus, He hears our cries, and sees our tears, He cares. If you read the book of Job, remember he suffered because satan wanted to break him down to the point where he would curse God, but Job never did. He praised, worshipped, cried, questioned God, in the end Job was rewarded for his Faith in God. Everything we go through in life prepares us to minister to others in the future, because we have experienced what the other person is going through. May I suggest that you go on a fast? There are different types of fasts, all water, partial (part of the day), Daniel fast: Fruits, vegetables, water for a number of days. It's hard but God is who gives us strength. If you go to family Christian store or any book store and find a book on fasting and prayer (christian) it will help and encourage you when you hear others stories. Or you can just google prayer and fasting testimonies. I hope I helped, I will pray for you.