Re: I don't think I can do this anymore
All I can say is - I've been there. Pumping is really hard. Going back to work is really hard. What I found most people didn't talk about, that was true for me, was what you say: I just wasn't getting much done! And my work is demanding, intellectually, and I was very frustrated about how much time the pumping was taking.
But I can also say, 2 weeks in is just scratching the surface. It all gets SO much easier. You'll get better at pumping, you'll figure out ways of doing some work whle you're pumping (I ended up having to set alarms to stop, because I would get engrossed back in my work and then look up and I'd been pumping for 45 mins! Eek!), and eventually you'll pump less. I think getting set up to pump on your commute is an excellent idea. I can also reassure you that MANY moms returning to work get 1/10th of their regular work done the first two weeks, even when they're NOT pumping! It's just a hard intellectual / habit routine to change. So think carefully about which parts you can blame on the pumping/breastfeeding, and which parts you have to blame on missing your baby, pregnancy brain, etc. Those were real barriers for me. And it really does get easier.
And remember even if you want to quit pumping - which is NOT the only plausible solution, trust me!! - you can't do it all at once, because you risk mastitis. So take things a day at a time and a step at a time. Tomorrow, pump on your commute and save that 40 mins at your desk. See how it goes. Remind yourself that others in your office take breaks for other things, and that stepping away from your work is a research-proven way of being MORE effective and insightful while you're working.
And feel free to PM me if you want to talk more; sounds like you're in a similar place I was 8 months ago.
Nursing, pumping, cloth-diapering, babywearing, working professor mama with the awesomest SAHD ever.