I have had all of these problems and have restored my penis sensitivity & cured related problems with iodine.
The glans, testicles & especially the prostate require a lot of Iodine to be healthy. Unfortunately taking Iodine orally does not get enough Iodine into the genitals.
The cure for this problem is to paint the testicles with a diluted iodine solution. For complete details see this link.
Caution: If you don't use a diluted iodine solution, then mix a "Carrier Oil" with the iodine to prevent burning the scrotum.