Hi Cathy,
I agree with the above posts. It's important to keep taking the tadalafil even if at times you & your OH might feel as though it isn't working. The nerves have had a battering during surgery and therefore can take several months for them to start healing.
I was a good eight months post op before my erections started to return.
If you get the opportunity to try injections, I would highly recommend you give it a try. It was a huge boost to my confidence (and a lot of fun) while my nerves were recovering. I'm now over four and a half years post op and my erections are really good, I still take tadalafil but no longer need the injections.
Good luck.
Kev.