I went to go see a specialist on my shoulder a few weeks back now. He came to the conclusion that I have one leg much longer than the other, which is putting extra strain on my shoulder spine. Also, he said that my right pectoral muscle is much bigger than my left pectoral and my deltoid/upper back muscles, this causing an imbalance which puts extra stress on my shoulder when bowling and throwing.
Managed to get a pair of wedges which have helped me no-end, after a few weeks of use I feel less stress on my shoulder. Been doing some exercises which my Physio told me to do daily, which have helped my shoulder too. Back to bowling quick now without having any pain after my bowling action, so happy days! Anybody suffering from the same kind of injury should always go seek medical help as there may be several reasons why the injury occurs.