It's possible to repair the wall damage yourself. You're going to want to locate the origin of the leak first. This article has some really helpful tips-
I am about to patch up this water damage on a low bathroom ceiling. What can i paint/seal the entire ceiling with to minimize future water damage? the ceiling is very...
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I have purchased a brown roll of paper because I wanted a consistent "vein" look through out the walls and the brown paper bags I was getting would sometimes be "vein...
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It's possible to repair the wall damage yourself. You're going to want to locate the origin of the leak first. This article has some really helpful tips-
http://projects.truevalue.com/maintenance_and_repair/windows_and_walls/repair-ceilings-walls-water-damage.aspx