ATHEISTS: I'm having troubles with being an atheist?

I think you're suffering from some of the withdrawal symptoms of religion. You see, before you were able to essentially talk to an invisible friend and let him deal with your problems when you found them too overbearing. Essentially, you let it all out and since it was mostly out of mind it was easier to deal with. I think you need to find other ways to deal with your frustration and anxiety. Try talking to friends and family or keep a journal. Either way, good luck, it's a process to leave a religion because its a lot like leaving a cult.