Hey there,
I'm so sorry to hear it didn't work out for you, but I really don't think you should give up. As a re-applicant you are obviously quite sure medicine is the path for you. I don't think you'll find it more difficult than other students in medical school because your grades are great, so you are of course smart enough.
This is just my personal advice of what I would do if I were you. You're still so young, you don't have to worry about your age being a 3rd time applicant (I'm getting into medicine after a PhD!), plus hopefully you still have your job at the GP surgery to fund your year, so financially you'll be in a great position when you start medicine. I do not recommend doing an alternative course with the aim of doing graduate entry medicine at the end. Not only will you spend 3 years of your life doing something your not really passionate about, you'll have wasted over 20 grand. Plus graduate entry medicine is even more competitive that the 5 year! Though I guess it may put you one step ahead of other applicants in the 5 year course, but I just don't think it's worth it.
I honestly think you should use this year to improve your application and apply again next year! You've got the grades so your fine in that respect. I think you need to be really smart with where you apply to and work to your strengths. What stands out to me about the uni's you applied to is that Keele and Bristol are very personal statement heavy, and Southampton is UKCAT heavy. HYMS seems like a very good choice with automatic interviews above 700, though I'm aware of their 'issues' this year! I'm sorry to say that your UKCAT was definitely not high enough for an interview at Southampton so it seems like that was a wasted choice. So for next year you need to work on increasing your average, and if you don't score that highly, apply to uni's that do not weight interviews heavily on UKCAT. Also, as you didn't get an interview at 2 personal statement-heavy uni's it indicates that this is something you definitely need to improve on. Have you got the ISC medical book on personal statements? They have some examples of superhuman personal statements, but don't be put off by that, they also have some great advice about structuring it. Get as many people to read your personal statement as possible and for everything you say you observed/did, talk about what you learnt from it. Improving on this I think is vital for next year. Get feedback from HYMS on your interview, you may have been near the cut-off for an offer, but if you weren't at least you know that is an area of improvement too.
If I were you I would spend the year working on the weak points of your application and apply again this October with a much stronger application. I can understand getting 8 rejections is very disheartening and a real blow to your confidence but don't give up on the dream just yet! I think it's always good to have a back up career option, but if medicine is truly what you want to do it's worth another try!
I hope that advice was somewhat useful, feel free to PM me.
Good luck mate, all the best!