Re: Still no erection
Sadly, I've met lots of guys with no erections after prostatectomy. Some get some response as long as 2 years afterwards, but it takes sustained effort, working it consistently every day.
Urologists at the top cancer centers will give testosterone after a history of undetectable PSA, but you have to find one who is better informed. There's no evidence that it's at all harmful, in spite of what they say on TV ads.
When you wrote: "Shots have seemed to just drip out the end of the penis" are you talking about Trimix? Trimix should be injected into the corpus cavernosum and should not drip out. If you're injecting trimix correctly and it's still not working, you can get some made up with a higher % of alprostadil in it. Too much may be painful, so increase it slowly. If you are using Muse pellets, they should melt and get absorbed through the urethra.
In any case, it may benefit you to find a urologist who has a specialty in Sexual Medicine. One guy I know got an implant. He says it's undetectable and loves it.