Trying 100mg sildenafil with elevated prolactin

So I’ve been with my girlfriend for 7 months and we are going on vacation to Mexico this weekend for Valentine’s Day, and I obviously want to fuck her brains out. Little back story, I got diagnosed with a prolactinoma around the time I met my girlfriend, and the entire time she’s been with me she’s been exposed to my condition. Unfortunately, my condition causes some issues in the bedroom like ed. Going soft or taking forever to get it up has been a common occurrence in the relationship. We are always able to make sex “work” but it’s not normal. It often time takes stimulation on my dick and a lot of foreplay. And when I do get it up, I can’t pound her brains in because changing positions makes it go soft or even when I go hard and fast it can cause it to soft. I can’t go more than one round, and sometimes I cum in like 3 minuets. I’ve been been taking caber, but there was only one week where my dick actually worked normally. And for the last two months my prolactin has been suppressed to 0 so my ed is back again. I just want her to see what I’m actually capable of, she’s been super supportive, but she hasn’t seen the real me, due to this condition I can’t control. I always love sex when it works, but I really want to pick up the intensity, which has been a struggle. Our sex currently has been more like making love, slow and sensational,but I want to really start going harder. I’ve tried doses of sildenafil like 20-60mg, but sometimes it doesn’t work that well. Would 100 be better? Will it make it hard so that I could actually achieve that intensity I’m looking for?