How to calm down a crying baby?

When I'm bringing my daughter home at night, she starts to flip out! I try everything to try and calm her down (bottle, pacifier, blanket, rocking her, changing her diaper, burping her) nothing seem to work and she only seems to get worse. She's 3 months and not teething yet. My husband seems to think that she just may be scared of the dark. Since I've ruled everything else out, I'm starting to believe that too. If there are other moms out there who have experienced this problem and have found a solution please let me know. I don't think that I can take it anymore. Another thing, she's not colicky cause once we bring her into the house or the minute we take her out of the car, she's fine. What can I do?