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Hello and thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 30 years of experience and would be happy work with you.
This definitely sounds like something that needs to be addressed by a veterinarian in person and not something that can be treated at home, without a veterinarian's intervention. It sounds as if he may be experiencing GI bleeding and perhaps even more. GI bleeding can occur if there is ulceration of the lining if the stomach or intestine. We can also see bleeding in cases of clotting abnormalities and/or immune mediated disorders. All of these can be serious if left untreated as the pet can lose a significant amount of blood. I would urge you to seek a veterinarian today for a physical exam and evaluation.
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.
My posted replies are for general education only and not meant as a diagnosis. Only after a thorough veterinary examination can a diagnosis for your pet be made and specific treatments be advised or medications be prescribed.
If you don't have a vet, now would be a good time to establish one. I am not sure why he would be licking his penis. It could be irritated if he was laying in a pool of blood or other fluid. It is also possible that he could be bleeding there as well. When there are clotting problems, we will sometimes see bleeding from multiple sites.
As far as the reporting, I don't know what to tell you, but I am quite sure that no veterinarian would insist that you have him neutered in his current condition until what ever is wrong is identified and hopefully treated.
The black tarry stool can be a sign if internal bleeding, so even if not seeing it come form the anus directly, seeing black stool is indeed worrisome and should be addressed.
A swollen penis that is not retracting is a condition known as prispism and should be treated as an emergency. It is no wonder he is licking it as it is surely uncomfortable. If the blood supply to the penis becomes compromised due to the swelling, the tissue can become irreversibly damaged. You need to seek a vet right away. In the meantime, cool compresses to that penis and lubricate generously with a water based lubricant like KY gel.
Here is a link with more information about that condition. LINK HERE
Great news. Good luck and please keep me posted as to how things progress for him.