54, my sexual MOJO vanished

54 year old. Pretty healthy. No drugs, smoking or drinking. About 20 lbs overweight. Active lifestyle. Don't take any Rx medication.

In the last 12 months lots of physical changes to genitals. I've had low T for several years (200-350 range) (not taking any testosterone, cialis or viagra)

Noticed night erections less and less and in the last 6 months, libido way down. My penis and testes have shrunk in size probably 10-20%. Some days it looks like they want to suck up inside my body.

Genital pleasure sensitivity down dramatically. I would say 70%. Pretty alarming to me.​​​

I'm not sure what to do. It's been very abrupt and almost a year ago I was very pleased with sexual performance and then it quickly cratered.

Suggestions and help would be greatly appreciated. I feel I'm too young for this.