Following a upper respiratory infection a couple months ago, i have had mild / sporadic burning in tip of urethra and bladder. urinalysis negative.?

Could be fungal: You should have an exam. Also, have them check an initial urine (not mid stream). For more www.Peedoc.Com or follow @thepeedoc.

Unrelated?: The urinary symptoms may well be unrelated to your respiratory infection. I would recommend seeing a local urologist for evaluation if your urinary symptoms do not resolve soon. You may have prostatitis or another condition.