You sound really stressed.    I've been married 25 years to a very healthy man,  and he's certainly lost his erectionErection problems once or twiceTwice-a-day during that time,  due to exhaustion.  

Is your wife asking you to go to ease your anxietyGeneralized anxiety disorder
Separation anxiety
Stress and anxiety,  (which is fairFair skin cancer risks,  you sound anxious) or does she believe something is wrong that has to be corrected?

I don't sense there is anything wrong with your body.  I do sense you have a lot of performance worries with her.

Best wishes.

Like Rose said, you sound really stressed and you should not be. Exhaustion and erectionErection problems just do not go together. If it makes you feel better, for many couples arousal "dysfunctionsBasal ganglia dysfunction
Carpal tunnel syndrome
Causes of sexual dysfunction
Chronic fatigue syndrome
Dysfunctional uterine bleeding (dub)
Ear barotrauma
Erection problems
Female sexual dysfunction
Femoral nerve dysfunction
Orgasmic dysfunction
Sciatica" are rather the norm, for both partners. As soon as performance stressAcute respiratory distress syndrome
Broken bone
Exercise stress test
Fetal heart monitoring
Neonatal respiratory distress syndrome
Post-traumatic stress disorder
Stress and anxiety
Stress echocardiography
Stress formula with iron
Stress gastritis
Stress incontinence is created, you end up in a vicious cycle. Even a woman can go into sexBuccal smear
Causes of sexual dysfunction
Child abuse - sexual
Delayed ejaculation
Erection problems
Female sexual dysfunction
Inhibited sexual desire
Orgasmic dysfunction
Puberty and adolescence
Rape
Safe sex avoidance if the man keeps asking "did you come yet?" The last thing you need is stressAcute respiratory distress syndrome
Broken bone
Exercise stress test
Fetal heart monitoring
Neonatal respiratory distress syndrome
Post-traumatic stress disorder
Stress and anxiety
Stress echocardiography
Stress formula with iron
Stress gastritis
Stress incontinence in the bedroom. And for guys obviously the performance anxietyGeneralized anxiety disorder
Separation anxiety
Stress and anxiety much worse because they think he can only please the woman with an erectionErection problems. Wrong. You can easily switch to manual pleasures or whatever you can think of until the issue is not an issue anymore. Or agree upon taking a little break from sexBuccal smear
Causes of sexual dysfunction
Child abuse - sexual
Delayed ejaculation
Erection problems
Female sexual dysfunction
Inhibited sexual desire
Orgasmic dysfunction
Puberty and adolescence
Rape
Safe sex until desires take their own course. Get a third opinion from your doctor but you are doing great!

Stress is probably playing a big part in this and the more you think about losing your erectionErection problems the worse it gets. I have been down this road and its not easy to talk about or get help even from your doctor sometimes. I have a friend who is a nutritionist and he advised me me to talk to a guy who runs a dietingLosing weight
Yo-yo dieting and mens health business. So i got something called prelox blue and male factorFactor ix complex 1000 and I have no problems maintaining my erectionErection problems any more. Its just a couple of tablets each day that promote healthy bloodAmylase - blood
Bleeding
Blood cells
Blood clot formation
Blood clots
Blood culture
Blood differential
Blood gases
Blood gases test
Blood glucose monitoring
Blood in semen flow and endurance for men. the place is www.myhealthabcmall.com, the guy who runs it has been in business for years and is very understanding and discreet. He conducted all my quieries via email. I could never ask my doctor about this as I would be too embaressed, no one wants to admit they have a problem down there. The products are by the way all naturalNatural tears and my nutritionist friend said you can use these forever and I trust his expert opinion.
Make sure you take some kind of action or your wife may lose patience pretty quickly, good luck.