The severity of your symptoms would dictate the decision of going to ER. A pain of 8 point to severe symptoms and warrant to go to Emergency room. They would give some injectable analgesics to you. But ER is not the right place to give you the correct diagnosis. A fluid in abdomen will need following investigations;
1) A PPD test for the mycobacterial infection.
2) PET scan (positron emission tomography)
2) Tumor markers (blood work).
These should be able to pin point the cause.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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