Dont worry I had the same thing happen to mine last week. My buddy tried tighting it(reverse thread) and must have had his head in his ****, because he loosened the drain to the point where it came out and stripped all the threads.
We managed to make it work with an oring, but dont ya know it explodes like niagra falls a day later.
To make a long story short, fixed it up with jb weld which stopped it up except for a small drip. I ended up paying napa 45 dollars for the filter with the drain built in. It kinda sucks because my other two filters are almost brand new.