HanSelo:
Above all, ignore any advice given to you on internet forums, with the exception of this:
Go see your doctor.
The OP asked for some advice. We give some advice. You give some advice and then you say the above which not only trashes everything everyone said and everything ever written on the Internet, it trashes what you said yourself.
My advice when I'm not livid at your stupidity would be to learn as much as possible FROM THE INTERNET about the specific medical problem so you are well armed when duelling with the medical profession.
The NHS have so many failure modes that one really needs to be quite an expect before putting one of their minions in a position of dominance over your health. It can literally be as bad as Dr Shipman bumping you off in his surgery or as honest as then genuinely failing because of lack of skill and knowledge and the system being in place to cover up the failure.
The actual method of conventional medicine is one of intervention. Of forcing the result that they want. This is one way of doing things and is necessary and often effective as a last resort. An example being chemotherapy. What they are actively ignorant about is preventative medicine. They think that statins are preventative medicine, that's how bad they are at it.
Generally the body can sort itself out but it needs the right nutrients to do so. Doctors do know this and often their most effective treatment is simply to provide some relief whilst nature fixes the actual problem. An example of this would be to provide some painkillers and get them to come back in a week or two. It would have got better without the painkillers but feeling better is often helpful to getting better.
Another problem with going to the doctor is it's not in their business interest to get you better but to match you up with a treatment that their industry approves of. Purely from a consumer rights aspect you should know your stuff.
Once had them try and sell us statins not because of high cholesterol but because she was due to have high cholesterol statistically.