feel lost without (someone or something)
To feel helpless or unable to function without someone or something. Ever since Mom died, I just feel lost without her. When it comes to repairing things, I usually feel lost without instructional videos. I'd feel lost without my assistant—she's the only one who keeps my crazy life remotely organized.
be/feel ˈlost without somebody/something
feel unable to work or live without somebody/something: I left my watch at home and I feel lost without it.I’m completely lost without my diary.