Roll on tennis balls wrapped in a towel and use the swiss ball to your advantage.
I find the below site great for giving you a basic understanding on back pain and providing some simple exercises for you to complete along with your TrickyFit Back care . I'm sure that regular core conditioning will help keep your back in good nik :)
Below is a link for FOAM ROLLERS. A fantastic addition to your back health. They help with back mobility, flexibility and generally stretching and exercising.