That sucks, hate the feeling of wanting someone you can't have but like you said everyone's just gonna say the same **** like forget about her and move on, but obviously it's not as simple as that.
I don't know what to say that could help you OP, but trying to forget about her really is your best, and probably only, option. Obviously you work with her and stuff, but knowing that you probably don't have a chance (sorry), shouldn't you just try to get along civilly with her but ignore any feelings you have?
Alternatively, you could always try to find someone else, someone who's preferably available, to fall for. Or even just you know... Help forget about her for a while. That's what I tend to do, but it doesn't work well in the long run unless you like the person and stuff. I don't know.
I wish I could really help you because you seem like the type of person that deserves much better than being hurt over someone you can't have, so if you can, remove as much of her from your life as possible, whether impossible or not, and just realise that she's happy and you should be happy for her too.
Sorry OP, I hope things get better for you in the long run.