I have had and still have similar symptoms as you describe. My penis was shriveled and extremely firm, cold and weak and aching. I had no morning or spontaneous erections for over a year. Sex and masturbation was not tempting at all as getting my penis erect was both hard, painful and depressing. And I was depressed.
First let me tell you the good news. Your condition probably will heal. My condition has gotten way better over time and last months I have had periods of time when my penis is normal. But then after a while it seems to be getting worse again. Still I´m slowly healing, I can feel it. From a cold rigid penis my penis has gotten back to a normal soft. From the last three weeks my penis has been normal and horny for 15 days. After that I´m again suffering from a bit of rigidness, coldness and aching. In the flaccid state the both corpora cavernosa chambers seem to be firm and erect in a weird way although my penis isn´t aroused at all. Instead its cold, shriveled and weak.
The bad news is that for me the healing took a long long time. I´m still suffering from a firm flaccid penis at times and I had my injury over 18 months ago.
For me the, I think, the healing began when I encouraged myself started to lightly jelq again with my member almost totally flaccid (maybe 6 weeks ago). I did this for 2-3 days and woke up with morning erection, after a 18 months break. Wow!. I think this is what really launched the healing process. But I am NOT a doctor. And the three urologist that saw me insisted that there was nothing wrong with me. I think they didn´t believe my symptoms and thought I was suffering from phsychological symptoms. For me the rigidness, aching and sometimes icecold penis was a lot more than phsycological. And once my penis started to have feeling again and the circulation was up again, I could remember how good sex could feel like. My best to you Zonqor and Mr. Nilsen.