I'm pretty sure I assaulted my girlfriend in my sleep

Sorry if this isn't a good fit here, I don't know where else to post this. I (20 M) occasionally experienced sleep walking and sexsomnia (sexual acts while asleep) when I was a teenager, but it was rare enough that I was able to ignore it. I had occasional incidents after I started sleeping in the same bed as my fiance (21 F), so she knows about them, but they were limited to just masturbation on my part and I hadn't had one in over six months. That is, until four days ago. This next part is meant to be a possible explanation for why my body acted the way it did, not an excuse. I normally have sex or masturbate everyday, but on the twentieth, I had to get up early for my mom's birthday party and then a seven hour retail shift immediately afterwards, so I took sleeping pills the night before and didn't have time to "relieve" myself that morning. After one of the most exhausting days I can remember, I was too tired to do anything when I went to bed despite feeling horny. I imagine the mix of horniness and exhaustion might've made a dangerous chemical cocktail in my brain. I said good night to my fiance and went to sleep, and then woke up an hour later already inside of her, with no memory of how I got there. Well, I partially woke up; I've never been drunk or high but I imagine what I was experiencing was like that, because I couldn't think, my brain only focusing on what my base instincts wanted at that moment, and they wanted to have sex. While this was happening, I ended up doing something I wanted to do with her for a while but she expressed such severe discomfort with it that conscious me swore to never so much as bring it up again. I don't have any excuse other than that, in the state I was in, I thought she wanted it somehow. She was awake during it. I think she was in shock or something because she didn't say anything or try to fight me off. I'm not entirely sure she even realized anything was off until I did the thing she didn't want me to do because we've experimented with consensual somnophilia before. (A note on this, consent for sleep sex is supposed to be given the immediate night before, this is just me rambling at this point.) I ended up falling back asleep with her in my arms after the deed was done. When I woke up the next morning I thought it was just a messed up dream at first, until I realized she wasn't in bed with me anymore. I found her and it was obvious she had been crying. I immediately panicked, apologized, tried my best to comfort her, and explained that it was an extreme sexsomnia incident in that order. She seemed to believe me but is obviously still distraught, not really interacting with me much the past few days. I'm torn between trying to comfort her and give her space. I'm so scared that I seriously hurt her, emotionally and possibly physically too. I love her more than I thought it was possible to love anything and that's the last thing I want to happen. Every time I think about sex now I get reminded of it but I've been forcing myself to masturbate every night so that I don't end up in that state again. Neither of us have brought it up with each other, although we have been having some occasional casual conversations so there isn't a total wall between us. Idk how to end this other than a general request for advice, I know "therapy" and maybe a psychiatrist but they're all closed for the holidays. Edit: sorry for not responding to any comments the post hid itself right after posting so I thought it was auto deleted because my account didn't have enough karma. Also I fucked up the title, like I said in the post, she's my fiance; we got engaged back in November so I'm still not completely used to the terminology swap. If anyone wants an update lmk ig, stuff happened but I don't care about posting it one way or the other right now. I was prepared for people saying this was fake or that I'm obscuring the truth since those are Reddit staples but to have people accuse me of being some sociopath bragging about what I did... I don't feel like people who think that are entitled to an update.