Thank you everybody, I shall look into all your suggestions, and see which i would like to go with.
The reason I want to try meditation is because I hold tension in my body, particularly my stomach, and really need to relax it. I also constantly think about my health problem, which only makes the symptoms worse, so need to learn to clear my head so I'm not always thinking about it. Although I'm not sure which meditation I should be doing, but hopefully once I look at the apps it will become clear. If anyone can offer any guidance to which type I need to do, please advice. (By type I mean for example, mindfulness, sleep, etc).