It took me 11 months post-SRS to have my first orgasm. When I did, it was in my sleep. I woke up from a "wet dream" -- wish I remember what the dream was about -- in full orgasm. What a relief! I had begun to think it would never happen. My O happened after going on vacation and long talks with a girlfriend who had her surgery at the same time I did. Her reassurance + vacation relaxation + dream ==> O.
Since then I invested in a lelo vibrator. I highly recommend it. Combined with a wandering mind, it's wonderful!
BTW, that first wake-from-sleep in full orgasm happened, of all places, in Chisinau, Moldova. Will wonders never cease. . . .