Dear Jennie,, You are right there is very little being offered for that period for 14 night. I found a few of much longer but nothing offering exactly what you want.
There are however several single offers for later in the year some even on this site so talk to the guys and gals in the know and who can at the touch of a screen or with a short call give you the answers you require...the cruise agents....most of them have freephone numbers Sorry but they are a better bet......Nei.
There are some late deals on this website to the Caribbean...I personally wouldn't rate Costa the same standard as Sea Princess but P and O Oceana is an identical ship and is in the Caribbean Feb/March...the problem may be that you are a single traveller as most of the cabins are doubles..best of luck with the hunt and hope the back recovers quickly!!
RCI have several ships doing 7n B2B cruises. Give them a tr.
To all that responded to my question, a heartfelt thanks to you all. I;m still looking but think I have found one - Holland and America out of New York. Any views on this line Jenni.