What should be checked when experiencing a sudden and complete loss of male libido. normal-high testosterone, no abnormalities in extensive bloodwork and no stressors?

https://www.healthline.com/health/low-testosterone/conditions-that-cause-low-libido#exercise Any tumescence? Once or multiple? May be medications, diabetes, blood pressure ,cholesterol , medical conditions. Consider Nocturnal penile tumescence (NPT) test, Intracavernosal injection test, Doppler ultrasound and assess if status may be impacted by MS or lumbar/pudendal issue. F/u/w/ urology

I would make certain you are not taking ANY other meds or supplements. Stop then now if your Dr agrees.

Libido is the lack of desire for sex as opposed to ED which is-erection. If you have lost the desire you need to see a psychiatrist. If erections then a Urologist for without being examined no diagnosis can be made. good luck