Yikes, you've REALLY got the side effects bad, haven't you?!? They should ease down after a week or so, but I guess you might not think it's worth it!
Ask your doc about Ultracet if you don't feel the Ultram's helping enough. Ultracet has acetaminophen in it (like Darvocet) as well as the tramadol. The tramadol supposed to be a lot healthier to take than opiates and is supposed to act in a similar way, but I don't think it has such a mental affect (making you not care about the pain and not notice it so much), which might be why you prefer the Darvocet so much.