For context, I am a male in late 20's. I have had symptoms of apnea/poor sleep for a while now and I usually wake up a couple times a night at least. I always wake up feeling very unrefreshed with a headache, I'm also very fatigued and irritable during the day.
I've been going to NHS doctors with my concerns(UK) - It was diagnosed as insomnia, depression and anxiety(way back in 2017). I've tried antidepressants but obviously that has not helped my sleep at all really.
Since this has been going on now for around 4-5 years, around 2 years ago I wanted to check the possibility that I had sleep apnea. I had a home sleep apnea test done with hope2sleep. They detected a minor amount of AHI(around

I don't think I slept much during the test, but they basically just fobbed me off and said there's no way I have apnea due to my appearance. I ended up pushing back and got referred to an ENT, who diagnosed me with a deviated septum.
I got a septoplasty done a few months after(mid 2019), but it didn't really help too much. Over the past year I have slept with breathe right strips as I feel like they help - I can breathe through my nose fine with the strip on.. but unfortunately I still don't sleep well.
I got this new test done this week, and the amount of RDI's is worrying. Their report from the sleep technician says I don't have apnea, but I'm aware of UARS. I've read the diagnosis section of wikipedia, and it seems to exactly tie in with my results..
If I do have UARS, what is the best way to get treatment. I'm in the UK so I'm very doubtful the NHS would be able to do anything. Does anyone have any experience, and what treatment has helped?