I have tried to look at some of the causes of persistent unexplained symptoms which I encounter in my practice and which are generally proven amenable to treatment over the years.
One word of advice regarding the medical system in Ireland is: it is impossible for general practitioners to be a master or a mistress of the detailed treatment of every kind of medical condition. The most important skill in general practice is to be able to diagnose patients and make a competent initial assessment and prescribe treatment. The greatest challenge for your GP is to be sure to pick up serious or life-threatening illness. Unfortunately it would add years to medical school if doctors were truly to be taught detailed skills for dealing with unexplained illness.
I delve more deeply into this subject matter in this Unexplained Illness Podcast