Hi and welcome!
I'm a 27 yr old GERD sufferer and live in the UK also.
You can be assured that you will get lots of support on here and I will be happy to give my e-mail address. I know what studying away from home is like.
The endoscopy will show if there are any problems.I think surgery is a very last option and in my experience, you have to have suffered for years like a friend of mine in his 40s. He had a weak LES. Even then, the surgery is not always successful.
You do need to focus on your diet and try to be stress-free as much as possible. This will be a start anyway. I am a newly qualified teacher and have had lots of time off work due to GERD.I believe my degree course and stress/diet caused the problem.
I am weaning myself off PPI's at present. So far, so good!