I just want to say straight off the bat..I am NOT throwing stones at you please know that.
I would just say I have kind of been there too, when I was younger, I thought it helped me, I thought it gave me confidence, it gave me none of those things you think it might do. Even if your gf is ok with it at the moment, it wont last long, what happens when she wants to drink all the time? At home perhaps, what happens if you two get together and she wants to drink al the time with the baby?
You need to communicate with her now in my opinion. I would like to encourage you to talk to your gf, she maybe has some issues that she feels she needs to drink through, in which case it would be better perhaps to know now. Because long term you are doing her no favors going along with it if that is the case. If she has some issues you can help her get some help. BUT if she doesn't but knows you have some and that drink is an issue for you, then how much is she prepared to give up to be with you perhaps?
Or even how much are you prepared to give up for your own well being?
Because if you know you have a problem with this and are still going to have a problem with it then perhaps you need to rethink what is good for you in the long run.
And I would like to say this to you now, I believe that if you two can't have fun any other way than with alcohol then you have a problem BIG TIME!! Now this is my opinion but please stop and think now about yourself. You have a responsibility to yourself first.
I have also sat opposite someone who's job it was to take care of me and be my support, the day after drinking himself I would say into a pretty bad state he could not even focus on me, he was highly aggitated etc, and he was there to HELP ME!!! . It oouzed from his pores, it smelt bad, he smelt bad, he had bloodshot eyes, swollen face...he looked like shit and this was his job!!! I also have another friend who has been warned at work about *weekend partying*, because again open pores just vapores of booze ....it is not good and again position of authority. I would like to say that neither of these people are just occassional drinkers.
Now if you both know you can drink and it is no problem then cool, some people can drink and it is no problem, but what you are describing it doesnt sound that way. I know I would have no problem being around drink now, I have this part of me pretty much under control and have done for years and I understand my limitations on this also.
But if someone I loved didn't give a shit about me having a problem with something and more than did it anyway-flaunted it regardless of whether I struggled with it, then I would think twice about how much they cared for me. And I would suggest you think about how much you care for her if you are enabling her in something so destructive to her but also to you.
Of course this could all be an overreaction on my part, I do not know you so please I say to you- take what you need from this and leave the rest. Only you know what your situation is, and only you can decide. I am not trying to preach abstinence here. BUT anything taken to an extreme is bad news.
Both of you need to get an idea of what it is you have waiting for you perhaps. You have said you have big tme flashbacks and while drunk...what happens when this al gets out of control.
Begin to manage now please, begin to learn to cope with your life with PTSD for you now, because it wont matter about her at all if you go down this road too far.
THIS is not meant to sound harsh I am trying to keep it a little more real for you.
Please take care of you