I just started this year and I must say that the workload is manageable and it is better than I thought. There is a lot of studying to do, but because I really enjoy the course, it doesn't really bother me. I am very very happy for how the course is going.
I would say that what I'm concerned about is the future of the job and doctors of the NHS with all the changes that are happening now. It is a rewarding career but also extremely demanding, so take your time to think whether you would perform well under pressure and whether the long hours that usually come with working in this field are something you are ok with.
I would definitely recommend getting some work experience, shadowing or volunteering in a relevant role. Not only you will have something to show on your personal statement, it would also help you decide whether medicine is he right career for you.