Five pounds isn't too much to be concerned about. We have a normal fluctuation in water weight that we as women can get. Also, did you have an operation on your arm or were you hospitalized? If you had an IV drip, the saline solution in those bags make you retain water, so it will take a couple weeks for that to get out of your system. It can also be a side effect of your medication.

Constant pain can make you lose your appetite, especially if you are the one that has to get your own food. Maybe there is another medication that you can take that will work better than the one you are taking. I'm sure your doctor will be able to help you with that.