Eu acho que a história que você está procurando é Contra a corrente'' de Robert Silverberg. Foi publicado pela primeira vez em A Revista de Fantasia e Ficção Científica, Outubro-novembro 2007.
Aqui está um resumo:
A car salesman leaves work early after a sudden but short-lived migraine. As he makes his journey home he notices increasingly incongruous changes to the road and the neighbourhoods he drives through, until it becomes clear that he is in fact travelling through time. We follow his journey, as with Matheson’s Incredible Shrinking Man, as the salesman finds himself heading backward in time in ever increasing speed. He makes attempts to communicate with people he knew in times past, but this proves frustratingly problematic.
Source
Lembro-me de uma cena em que ele entra em uma loja para comprar algo, com seu dinheiro do futuro, e espera que o funcionário não note nada de errado. (IIRC, ela não.)
Ela faz:
He stopped at the first motel on Lombard that had a vacancy sign and registered for a room. The price was only $75, but when he put two fifties down on the counter, the clerk, a pleasant, smiling Latino woman, gave him a pleasant smile and tapped her finger against the swirls of pink coloration next to President Grant's portrait. “Somebody has stuck you with some very funny bills, sir. But you know that I can’t take them. If you can pay by credit card, though, Visa, American Express—”
Of course she couldn’t take them. Rackman remembered, now, that all the paper money had changed five or ten years back, new designs, bigger portraits, distinctive patches of pink or blue ink on their front sides that had once been boringly monochromatic. And these bills of his had the tiny date “2004” in the corner.
Eu acho que ele estava dirigindo em uma ponte em algum momento.
At the Bay Bridge toll plaza they had taken down all the overhead signs that denoted the FasTrak lanes. That was odd, he thought.
ele vai se encontrar com um amigo de infância dele quando chega no momento em que eles eram crianças.
Whatever had happened to old Al? Rackman had lost touch with him many years back. A powerful urge seized him now to drive across to Berkeley and look for him.
Ele poderia até ter se visto? Eu acho que ele compra um deles - o amigo ou ele próprio - uma bebida.
Não, nada disso acontece. Ele concorda em almoçar com seu amigo.
No final, acredito que ele apenas decide continuar dirigindo e ver o que acontece, chegando à conclusão de que não há como reverter o que havia acontecido.
A história termina com:
He reached for the ignition key. Silently, smoothly, the Prius floated forward into the morning light and the night that would quickly follow it and into the random succession of springs and winters and autumns and summers beyond, forward into the mysteries, dark and dreadful and splendid, that lay before him.