Action seems to follow feeling, but really action and feeling go together; and by regulating the action, which is under the more direct control of the will, we can indirectly regulate the feeling, which is not.
Even if you are going through HELL right now, there's a good chance at least 1% of your life is going well. Be grateful for that 1%. Enjoy having that 1%. Cherish it. This can help you deal with and convert the other 99%.