John, Welcome. Glad you are recovering your continence, sorry about your ed failure. With one nerve bundle removed, I must be honest and say that your recovery MAY be delayed. Repeat-MAY. It's probably too early at one month to know what you will have-short term. In the meantime, an aggressive course of penile rehab should be your next step. Your doc says manual stimulation and experimentation. That's good, doctor suggested self-stimulation is great, gets past any childhood phobias and such when maybe it was taboo for some of us. Step 1 here. The doc told you to do it, so do it, often... 
If you haven't already found, having orgasms without erections is very easy to do. Most start with a vibrator, then move on to hand or partner assisted stimulation. Relearning and retraining, stimulating the nerve routes to remember and regrow is a part of your ed rehab now. Early use of Viagra or other ed drug is Step 2 in the process. You want to infuse the whole area with fresh blood, and this is what they do. Treat the penis like you would any other part of the body and exercise it to prevent atrophy. This is easiest achieved with Step 3- a manual medically approved penis pump, used daily. This infuses the organ with blood, stretches tissue, fills the cavernous cavities, and provides the rehab needed. You have a block in the nerve track now, most likely, but the equipment must be kept in a state that it will respond as required as and when the nerves start healing and regenerating.
There's lots of people who advocate using penile injections, in combination with the other 3 steps, to accelerate recovery of ed function. There's been some studies that suggest that this combo of things is the best quickest method to recover function, if it is gonna come back. Some injections are Step 4. That's a whole seperate post, so we'll leave that til later.
Now, the honest news, some of us, self included may take up to 2 years---or more--to recover enough erectile function for penetration and 'normal' sex life'. Some few never do recover. BUT, big BUT here, your best chances for full recovery is an aggressive course of therapy. I hope I didn't give you too much of a negative idea, but I want to be realistic. You may be one of the lucky ones who in 2 or 3 months start recovering quickly. I hope and pray that you are....I also hope you will continue to post here, sharing your Journey with us.