Thanks for the responses. Ryan, I'm you're probably right that putting more miles in will help me deal with the stress of running for that long at one time.
With regards to the electrolytes, I took 3 gels during the race (I think around mile 8, 15, and 21). However, I only drank water. I was tempted to take Gatorade, but I've never drank it during a run before so I wasn't sure how my stomach would react….didn't wanna risk it.