As humans we don't always get to think and feel the exact same everyday. Things happen and before we know it, the thought of love, peace and happiness has escaped us. That's ok because we are human.  We are definitely allowed to Begin Again! Forgive yourself for whatever bad thoughts or feelings you may have had and start to pray/meditate for better thoughts and feelings. Ask God to handle the situation, he will! You're allowed your emotions, just be careful to not hold on to those thoughts and feelings because just as we can manifest when we feel good about things, we can also manifest when we feel bad about things and that is how we manifest the bad things into our lives.