try giving her gripe water

It may be colic like @tiffrae said but you can't be too sure make an appointment let the dr know what's going on but don't be too hard on yourself I felt that way with my son for awhile but turns out he had reflux and on top of that was a bit spoiled and use to someone holding him it was very overwhelming at times but believe me it's well worth it and you'll be able to go back to work just have to determine the cause of her crying and constant screaming and go from there don't give up God made us women equipped and strong enough to be mothers so you can do this and you're stronger than you know

She is still so young and needs reassurance! She got ripped out of her home (the womb) so quickly it can take some time to adjust. I promise it will get better. Baby wearing will help so much cause your hands will be free and she'll still feel secure

look into baby wearing, that way you can still do things.... also see if you can find a sitter every once in awhile even if it's just a trip to the store alone you need the time to yourself

Constant need to be held, keeping her busy. She isn't amused at all by swings, play mats, mobiles, constant need to suck on something, has to be held to fall asleep and once I put her down she screams... I pretty much sleep sitting up holding her so she can sleep. Makes doing anything but caring for her extremely difficult.. I can barely eat or use the bathroom. I have no idea how I'm going back to work. @dlove2016

sounds like she's colic. look up colic massage and try some on her. being a ftm is rough and on top of that your a single mom. A lot of mom's think they are not cut out to be one but turn out to be the best ones.

What makes her high needs if you don't mind me asking?