Last night, I was playing around in the house and hit my arm on the top of a chair. The only way I can describe it is, the rounded metal tube hit the anterior side of my ulna. It felt like it pushed very hard into the interosseous membrane. Needless to say it was very painful. After a minute I heard ringing in my ear. At this point I let my wife know I was going into shock and was going to pass out. I did pass out, at which point she said I had a seizure. I don't think that happened because when she described it, I semi remember me consiously trying to move my head and talk to her, just not doing a very good job. After I came to I started the profuse sweating and felt neusious. After about 30 minutes I was able to drink some OJ and move and all symptoms passed. My question is should I go to the ER today to be checked out?

I don't think this one is for the ER. We don't diagnose, but I will go out on a limb to suggest that nothing serious has happened as directly from the injury.
You could possibly have an underlying condition - or you may just have had a huge drop in BP. Arrange for a complete physical with your regular MD.

My dad hit someone with a golf ball once, many yards away. The man filed a million dollar lawsuit against my dad for a 'resulting' medical problem. His doctor told him that the condition was underlying, had nothing to do with being hit, and that he should thank my dad or it might not have been found. The man dropped the lawsuit.