Hey @rd69 Sorry you find yourself here but you will find the ladies here helpful & full of kindness.
My story is very similar to yours, I found the Berlei bra supplied by BCNA to be not quite right straight after the op.
I had brought some $10 soft bras from Best 'n less (like sports bra) used them and another soft type bra from Target .
Yes I wore them at night as it seemed to hold everything together so to speak !! and I think this was recommended by the breast care nurse .Yes I was told to use panadol for pain relief ,the dressings that I had were waterproof but I tried not to get them too wet . 4 days later water seeped in and I replaced them with dressing that the local nurse had given me ,she visited the day after I came home .Call the breast care nurse before wed if your unsure of anything .
Good luck xxx