Hello and welcome Notso.
First of all, hang in there, you've got lots of runway left.
Summary of just one man's journey. Your mileage may vary as results seem to be all over the place.
I got some mild, partial results from Viagra a couple of months after my RALP, but nothing too useful.
Tried both Levitra and Cialis in the 3rd month. Nothing from Levitra, wicked headache from Cialis -- so much so, I've only tried it once more, at maybe the 6 month point. Took a couple aspirin that time with the Cialis which helped a lot -- only an unpleasant head and neck ache.
Kept up with the viagra about 2-3 times per week, but with slowly less and less results over the next 9 months or so. Got divorced during this time, so who knows what was mechanical and what was mental.
about 15 months out, I tried Levitra again -- Big response. almost like a teen again! Results after that have been more modest, but fully 'useable'. I've added an Impo-aid ring to the process and my girlfriend of almost a year has had no complaints.
Lately I've gotten usable erections on occasion without the Levitra or the ring, but better and far more reliable with than without. The ring also helps prevent the slight 'leakage' I sometimes get at the moment. There was a mental training period involved in that -- used to be a gusher, now I can usually control it to nothing, but the ring is a big help with both that and a weird and annoying tendency to get softer as I get more excited with penetration.
Net net, it took me the full two years to be (almost) fully functional again. Having an understanding partner is a BIG help, particularly when the results occasionally fall flat (pun intended).
Levitra may or may not work for you, and you should try each of the drugs at least a couple of times over the course of the next couple of years as things change. Levitra really, really needs to be taken on an empty stomach or (at least for me) it doesn't work. But, I can take it about an hour to 1.5 hours before going out to dinner with wine, then still have a good time later in the evening.
Others will report different results, but give it time and good things may come back to life!
Best wishes!