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Your internal pain and burning is continuing for almost 2 years, I am sure you must have consulted Gynecologist and investigated to find the cause?
Urinary burning is indicative of infection that is Urinary tract infection
, which may be there in vagina also but it can be treated easily.
You are taking oral pills also for painful period that is dysmenorrhoea. You should once again consult Gynecologist and get Ultrasonography
of abdomen and trans vaginal also to see any abnormality. We should search for any mass, infection, or cystocele, rectocele etc.
Treatment depends on cause infection can be treated and if anything correctable by surgery can be done.
If it is making sex difficult it point to dyspareunia
which may result from vaginismus
you should see a Psychiatrist
if everything is fine in investigations.
Hope this information helps.