I have no suggestions but I understand what you're going through.
I introduced a bottle at 4 weeks which dd took fine about once a week. When I tried to go back to work when she was 3 months she absolutely refused. After 3 days of her not eating except my lunch hour, I threw in the towel and quit my job. Almost everyone who knows me says that I should have just left her, she would have taken it eventually. But I just didn't feel that she would, or that the job was worth what she would go through.
You're kind of taking the road everyone said I should have taken, so I am interested to hear how it turns out for you. You're in a harder position I think because you have a really good job, but your kiddo is actually getting dehydrated from it. I don't envy that struggle.
Best of luck to you and please keep us posted!