struggling mom

Hi. My baby girl is 7 weeks. She is adorable and I love her to bits. I am finding it so difficult to accommodate her needs. My maternity leave ended but I was forced to extend it because I can't rely on anyone to take care of her and because I'm just so exhausted. She doesn't sleep much during the day and needs attention every minute. If I'm not holding her or playing with her, she cries. She takes 10 minutes naps every couple of hours, so it's impossible to do anything else such as shower, sleep, or even eat. At night, she sleeps 2-3 hours at a time and wakes up for 2 hours in between. I have a very bad/difficult sleep routine myself. I can't easily fall asleep and if anything wakes me up, I can't fall asleep again so if she falls asleep, it would take me at least an hour to sleep and that only gives me an hour to sleep myself before she wakes up. Since I delivered, I average 3 hours of sleep in 24 hours ! I'm just so tired, drained, and can't believe this is what's everyone goes through. My husband is extremely supportive but works long hours . He spends the night with her every few days so that I can sleep longer but then has to go to the office at 7 am and I just feel so bad for him. I am searching for a nanny to help out and this is taking ages . How do you manage ? How do you handle this ? It's 4 am, I'm still awake and have the worse headache ... I am starting to feel so depressed