I agree, as much as I want someday to have normal sex , my fear of disappointment makes me only try injections maybe once a week with no satisfaction at all. My prescription was just changed to remove the ingredient that causes the stinging , we will see if it’s any better but if I can’t feel anything or have an orgasm I’m close to sadly give up
. I tried Bimix no stinging but was at 70 units and not a great erection and felt nothing, good luck

Check out this discussion about how to use Trimix
https://connect.mayoclinic.org/discussion/my-trimix-experience/