Thank you for all your feedback. Yes there both prescription only. I don't use the GP, I prefer online pharmacy. The online doctor at The Family Chemist gives me advice and I find it more efficient and reliable, but ultimately it depends on me. I think after careful consideration and reading comments I will be going ahead omeprazole.
In regards to my diet, I am going to start eating more healthy and cutting down on certain foods that cause me to have heartburn etc. I think hopefully both together be more effective. Stopping smoking has helped but my diet became poor as I have other cravings so its balancing it all out I suppose.