Hi JoJo,
I too have been through many instances like yours. Several times, I have felt like I was going to have a nervous breakdown. I don't know what your spiritual or religious beliefs are at this point, but what has been the most important thing for me is heartfelt prayer. Every day, I pray for God's direction and for Him to free me of my irrational fears. I highly recommend the book: Combatting Cult Mind Control by Steven Hassan. He point out that people like us are suffering from the after effects of mind control and deeply instilled phobias.
Here are some very important points to consider:
1) Go to the public library and browse through the archeology section. The archeological record from around the world has absolutely proved that humans have been on earth for much longer than 6,000 years as the Watchtower teaches. Countless human fossils that are several hundred thousand years old have been unearthed around the world.
2) The geological and scientific evidence from around the world proves that the global flood of Noah was not an actual historic event. Actually, the scientific evidence shows that it would have been impossible.
3) The archeological evidence pretty well substantiates that Jeruselum was not sacked in 607 B.C.E.; therefore shooting the 1914 doctrine full of holes. Read the book: The Gentile Times Reconsidered by Carl Olof Jonsson.
It sounds like you may need some exit counseling. I will be gettings some as I too suffer from the same deep fear and feelings of anxiety that you do. Here are some resources that may help you.
Take one day at a time. Try to find a spirtual support system. Remember that God is all loving and all merciful. God is not a fallible, neurotic, insecure, jealous, and vengeful God as portrayed in the Old Testament. It is impossible for the omnipotent power of the universe to have frail human characteristics such as wrath and jealousy.
This temporary experience just may well prove to be a powerful experience that will qualify you to help others just like you. Remember that there is lots of love and support for you that is just a mouse click away.