Long story/questions

my daughter is almost 7 weeks old now. And since day 1 I have spoiled her by hardly putting her down and her sleeping with me (been breaking that habit for the last couple weeks, has not been easy) but now I am regretting holding her so much because anytime I put her down awake or asleep she freaks out. I tried letting her cry it out but after about 5 minutes I feel bad and gave in and pick her up. Even when someone else holds her she's ok for the first couple minutes then it's the same thing and she won't calm down until I have her again. I go back to work in 2 weeks and need any tips on how to break this habit? Please I'm desperate!!