just read this whole thread.
Sex dreams are usually related to sex and to desires. Although your current feelings of being taken advantage of at work might play into the overall dynamic.
The salient thing is that they are recurrent, and that you often waken with a hard on.
most of the time, sex dreams coincide with a night time erection. You are not popping boner's at night because you are necessarily excited, your body actually will spur an erection, several times thru the night, for the purpose of filling the penis with blood... because in its floppy state blood flow can get compromised so easily. ( laying on it- it getting bent over- etc... so the male body will get an erection at night to straighten the thing out.... ) however, because the erection mechanism and dick itself is wired to the sexual arousal center in your brain, night erections CAN precipitate sexual fantasies. That is- often you think a sexual thought- and that gives you an erection... but the same wiring works in reverse, too. An erection activates sexual thoughts.
Couple night boner activated sexual fantasies, with a feeling of powerlessness or not being in control at work.... and you have the perfect scenario for your brain to conflate a sexual fantasy with your frustration into a frustrating sexual scenario.
The fantasies your brain concocts in sleep are usually woven of experiences or fantasies you have entertained when awake.
so the question is... forget porn... when you are jacking off, and porn is not involved, what do you fantasize?
You say in the dreams you feel like a girl. One of the most common fantasies for men is to imagine what its like to be a girl having sex. This is just ordinary empathy and men's fascination with women's perspective in sexual interactions... MOST porn takes the form of WOMEN being portrayed as being AS driven by sex as are men. i.e. women who act like horndogs. That is an interesting conflation of Women... with the way Men feel and act regarding sex.
Perhaps the sexual situation you most identify with being out of control is that of a woman being raped... but you can not see yourself as the woman... and so it might manifest not with you As a girl- but in the ROLE of a girl... and your aversion to homosexuality causes it to manifest as a forcible situation.
The dreaming brain is NOT very clever, nor consistent.
Now as to recurrence. maybe that's because the situation at work has not resolved and you still feel taken against your will, so to speak.
Or maybe part of you LIKES it.
You call them nightmares... why? they sound like sex dreams... but are you actually emotionally distressed in the dreams? Or merely acting like you are? Is the dream version of you ROLE playing?
When you wake, is your heart pounding with fear? Or is the distress you feel POST waking and centered around the fact that you are dreaming of being fucked?