Loses power uphill and SES light blinking

What is your question?

Happened after 3 hours of driving on highway while going up fairly steep incline. SES light started blinking all the up the incline then stayed on for a minute then back to blinking. Now rough idling. First time this has happened since I got the car 2 months ago. Also first time I've driven the car for longer than 2 hours straight.

What makes this problem better or worse?

Worse on inclines

How long has your 2001 Nissan Altima had this problem?

First time today