Sorry for this meandering side story but there is a point i promise - when i was 20 i got back ache - it persisted for 3 months and came with night fevers and loss of feeling to the feet.
i was a student at the time (with dreadlocks to complete the look) and despite being a biology student and telling each doctor i saw that "this isn't just backache, backache is a f***ing symptom" and pointing out that all evidence points to an infection - i got very little attention. When i went home for Christmas i saw my family GP who knows me quite well and saw that i was in trouble - i was referred to a private specialist that day who correctly diagnosed me within 10 minutes, i was admitted to hospital and got an MRI scan and full blood check.
long story short - bacterial infection in my spine - 1 week away from paralysis - 2 from death.
Thanks to persistent nagging, insisting on 2nd opinions and getting referred to a specialist, I'm alive and healthy today with no loss other than a lost Christmas and new years in hospital and couple of fused vertebrae.
If you have a persistent problem, its causing you pain and discomfort, go see a specialist!