You can get something called NGU from receiving oral sex. It can be caused by anything other than gonorrhea (NGU stands for non-gonoccocal urethritis). Basically, it's an infection in your urethra caused by a germ that shouldn't be there.
It could be from chlamydia (unlikely from oral), normal mouth bacteria, adenovirus (usually causes upper respiratory infections, like bronchitis), strep, etc.
Have you had sexual contact with your wife since you received the oral? If you have, and you have an infection, she will need to be treated. If your wife performs oral sex on you, and has been sick, she could have been the one to infect you. If your wife doesn't perform oral on you, that's going to be a harder sell, obviously.
You could also have a urinary tract infection, an inflamed prostate, or something else absolutely not related to sex.
So you can go to your doctor, explain your symptoms, and at least get a urine test that looks for white blood cells and bacteria in your urine. By law, they are not allowed to tell your wife. If you live in a small town, or your doctor or his staff knows your wife, I can understand why you'd be hesitant. You can always go to a Planned Parenthood in the next town over or an STD clinic.
The important thing first is to get checked. The rest will follow after. Just get checked first.