I have yellow semen with a brown/pink discolouration and a sore enlarged testicle.?

Over the weekend my right testicle became sore and enlarged and my semen seems to have turned a yellow colour similar to urine. I also noticed a pink/brown discoloration. My prostate seems normal in that I don't feel anything in regard to it and sexual function is normal. I'll be seeing my GP tomorrow and am just after some form of heads up of what it possibly could be. I don't wear tight underwear or pants and I have just recently had a bug of somesort...cold or flu...seemed more flu like. I've also been taking herbal suppliments to my sperm (prescribed by my IVF Dr).