You are doing great. I had some really rude staff as well, I was so stressed and in tears. Then that affects your supply as well. Just ignore them. I hand expressed into a tiny sterile cup, then put it into the syringe, got a similar amount to you. But it will increase slightly day by day. You can try the breast pump after a few days, think it was about day 3 - 4 when I gave it a go.
Keep it up, you are a star Hun.