Thanks guys for all of your advice.
I suffer from extensive neuropathy, fibromyalgia, depression and I have to use a cane to walk. The pain can get so bad that I can hardly move. As well as Morphine I also take anti-convulsants to help control the amount of pain I'm suffering.
MikeL99 you are right it is for convenience that I've changed to tablets and also the Doctor thought that it would be better to have a constant amount of morphine in my system to help cope with the pain. It's probably just teething problems and once I'm back to work [very soon] that will hopefully, help me sleep too.
Take care everyone.