Need some advise ASAP.

My baby girl is 7 weeks old and she got really bad cold she's struggling to breath and you can see her moving her hands and feet up in the air to catch some air I feel useless I don't know how to help her. I asked doctor and he said just leave it to nature she will clear by herself or I can tickle her nose so she will sneeze... Really that's all what doctors suggesting. That's a small baby and I can't stand watching her that way specially at night when she can't breath she's shaking her hands and then crying and I can't stop her from crying. please let me know if there is anything. for now I'm using saline Nosal drops and I'm using syringe to get some of the cold out and I'm using humidifier cos that's what I read online. any other way to help her please let me know. thank you so much.