We had a long arsenic hour that started from around 3-4pm & lasted until around 7-8pm. In the end, the only thing that worked for that time of day was a sling and patting her bottom. It probably took DD about 10 mins to settle in it, but once she was settled, I could actually do things...like go to the toilet!

DD also had reflux, so both the cot and the pram (we had a bassinet style pram) had the mattress elevated at one end to keep her head above her feet. After feeds, I would read her a story before putting her down.

In the mornings, when she was due for a nap I would pop her in the pram and head for a long walk - to the supermarket, shopping centre, by the creek, wherever - that would last about 2 hours (home with about 1/2 hour until the next feed). The movement kept her sleeping, and sometimes she would stay asleep for an hour once we stopped. This only worked in the mornings, not in the afternoons!

Good Luck! Hope you quickly find a solution that works for your family!