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I am a very emotional man. Thrimix has been working really well for me. This morning I had a girl over, I expected sex, did my injction, got a hard on, but she had a little hangover and didn't want to have sex. I was really upset inside and my erection basically went away. As I was driving to my other girlfriend (nice to have spares) my erection came back fully. She was fun and we had a great time.
I'm sure if I had more units than the minimum I usually use Thrimix would have overrode my emotions, but at the usual amount it really affected my erection.
Interesting!
All the best.

Weird

Sounds normal, and expected. Many, Many things affect an erection. Pills, Injections, etc. affect it.
And sounds like the amount of Trimix used is good. Negative emotions caused it to take a break, then revive when good emotions kicked in.

When I use Trimix, have an orgasm, many times my erection will subside.. then come back with additional time or stimulation.

I would stick to the same amount. Sounds like it works well for you.
IMHO

It's hard to quantify, but i am certain that anxiety and stress DO affect injection results quite a lot.
It's actually quite annoying, when you go on a bad streak you start anticipating and worrying "it might not work well", which actually makes it even worse...

Case and point,
Caverject never worked great for me, but I used one last night.
I got a partial erection, and it lasted maybe 30 minutes.
I know that before I had maybe 90 minutes of a good erection.
And last night I used it just to see how well it would work, and my thinking at the time was it probably won't work well.... yes, could be my injection. But it does have an effect.

It is just how it works. At least with injections, if we aren't feeling it, we can adjust our injection.
Add 10% or so to give that extra kick