Hi D_Cymro,
Have you considered the Alprostadil injections? I know it doesn't sound very appealing to stab a needle into your penis, but sometimes 'needs must'.
One good thing about the injections is that you can increase the dose if a lower dose is ineffective. I had to increase to the max. (40mcg.) to get a good effect, but it was well worth it. :-).
Also, have you considered asking for Invicorp injections? It has fewer side effects than Alprostadil, but didn't work for me.
There are periodic shortages of most of these medications, so it might be a good idea to have more than one option in case one isn't available.
By the way, I would suggest that it might be a good idea to continue with the 5mg. of Tadalafil nightly, as it is my understanding that it can be working whilst you're asleep, even if you don't see any evidence of benefit. And, of course, keep pumping.
Best wishes,
JedSee.