People often experience stimulation when taking Tramadol. As you have already discovered, Tramadol (Ultram) has SSNRI activity which is responsible for the "speedy" feeling you are experiencing. Unfortunately, in my experience, this feeling is always present when taking this substance. You will most likely get used to the feeling, and eventually come to enjoy it. Because this is in the basic drug discussion forum, I feel that I should warn you that Tramadol lowers the seizure threshold and in higher doses has been known to cause generalized (aka grand mal/tonic-clonic) seizures.
In any case, please be safe with this drug (and all other substances).