You have my sympathy, Jewelrnca. Following on from perfect baby DD1, so easy to care for that I thought I was the perfect mother
, DD2 was a shock. Even in the post-natal ward she’d be wheeled out of the night nursery because she was waking the other babies. Just as you describe above, unless I had her strapped to me (and even sometimes when I did) she cried constantly and rarely slept. No obvious medical problems. My district nurse asked me to keep a diary of her days and then told me a baby couldn’t possibly sleep so little and cry so much (helpful!). We never did get to the bottom of it, but at 6 months we suddenly turned a corner and from then on she was the most laidback, contented child anyone could wish for. Fingers crossed for you!