Hi, These are all the symptoms I have at the moment
Hi welcome to Chat Doctor forum. It appears that your partners vaginal PH might be acidic, due to some infection hence the irritation while peeing after intercourse, for this both the partners should be treated completely.  I advise you to show her to a gynecologist for diagnosis and treatment. The things you have described are symptoms of chronic U.T.I. caused by continuous exposure.  All your symptoms suggest some infection or malnutrition. I advise you to consult a physician for diagnosis and treatment, You may need to have C.T.scan of the lower back along with other routine tests for confirmation.  Wishing for a quick and complete recovery, and thanks for calling.