Solutions for ascites (fluid build up in the abdomen).

I have endometrial cancer that spread to the liver. I'm on my 5th recurrence. Last fall I was started on a new treatment but before it started to work I developed ascites. I had fluid removed from my stomach every week. First they numbed me and then struck a large needle into my stomach. This was done about 8 times then the new treatment got rid of the ascites. Now I will be getting another new treatment and the ascites has come back. They wanted to drain it again and I said no. It's so painful when they numb me except when they inject slowly. But most of the time they shoot it in too fast and I hate it.
Has anyone had ascites and what have you done to lessen it? My stomach gets larger and larger every day and the new treatment doesn't even start for 2 weeks. It is hard to stand up straight.