Ah, things just clicked into place for me while I was making dinner. We have evidence that Hiro's girlfriend had a brain anuerism and he wished to cure it. When he came back to the present he said two clues that really stuck in my mind; "I went forward, backward, I coudn't save her," and "I didn't teleport back, I took the bus." Those coupled with the fact that Hiro will be on Scrubs on thursday made too much sense.
He's going to take his girlfriend to Scrubs to try to save her.