So its all good news in my eyes! Echo came back normal on all fronts (I have quite a strong heart apparently), nothing apart from Afib on my ECG's, and I've been symptomless for 2-3 weeks now. I feel brilliant! Now I know there's nothing structurally wrong with my heart, my valves are good, I can finally carry on with my life and do the things I love without worrying about impending death!
Been prescribed Propranolol in case I have an attack (Pill in Pocket), and he has sent a letter to my GP about possibly prescribing Flecanide (not sure if I spelt that right), if my symptoms worsen. My EP is the best doctor I've ever seen, so personable and extremely knowledgeable on the subject. Answered my questions thoroughly and comprehensively, and gave me reassurance that he's not worried about my condition at all because I have very low stroke risk. No blood thinners prescribed as he deemed it not necessary.
Overall, I am so much more confident about my situation, and now I know my heart is structurally normal and strong, I feel like I can just get on with my life!