OP I can relate to how you are feeling. I recently ended a relationship and this was the main reason, amongst being controlling etc but this was what affected me the most.
It happened 4 times within a time frame of a year. Every time it happened he had been drinking a lot. He claimed he didn't know he was doing it.
The last time it happened he was very drunk and he was very forceful. It has been engrained in my mind ever since.
I just could not look at him the same after that. I was nervous to go to sleep next to him, so much so that if he was staying over at mine for the night I would go to the other room as soon as he went to sleep.
I Googled everything I could find about sexsomnia. To this day I don't know if it was this or he was jusy horny and wanted his way after drinking.
The feeling I just can't describe. The only way I can is that I felt like a piece of meat. I was pushing his hands away and then he just kept carrying on but each time more determined. (on that particular occasion we had people staying over so I had no spare room or sofa to go to).
It was a newish relationship so for me it was easier to walk away. I would make a bed up in the spare room for him and process how you want to go forward.
You should not be afraid in your own bed!
Wishing you the best OP. I know it's not easy.