I have been suffering from an irritated/uncomfortable urethra as well. At the beginning my doctor thought it was me working myself up because they tested my urine five times and found no trace of a uti. It all began after I had been treated for a bad uti.  I began to remember the symptoms and when once would pop up I would immediately think I had a uti. This strange discomfort comes and goes and I don't know what to do.  It usually happens after I have oral sex.  Someone please help me