You should have felt something, at least after a week or two. I felt immediate changes the first day on my first injection which improved through the first week, although I was/am taking test cyp, a much faster acting ester than what you're taking.
It makes sense that you didn't feel much better though because the injection didn't improve your blood serum levels. That being said, once your T levels are "optimal", it will take months for all of the improvements to take effect as equalo mentioned.
Equalo, the OP's blood serum levels wont "spike" like someone taking test cyp/eth because Nebido (testosterone undecanoate) is metabolized more slowly and sustanon 250 has 100 mg's of test undecanoate in it. As you mentioned, he's not on a good protocol. With Nebido, his levels aren't going to drop after 7-10 days like they will with test cyp/eth, although they will eventually drop, just more slowly.
The other posters like to jump on me for asking this question, but do you watch a lot of porn/at least once per day?