Congrats on the long ride!

For the saddle- it may be that you just need to adjust to riding more. You may need a new saddle. There are tons of threads about people's saddle woes. My personal experience is I just had to get my sit bones acclimated. I used to whine about my saddle all the time, then I started to complain less as the miles added up.

Fig newtons are a cheap way to get more energy. I like to carry Sport Beans and Luna bars on the longer rides. I usually have one 24 oz Polar bottle with water and one 20 oz Polar bottle with NUUN (sugar free electrolyte replacement). Sometimes on my weeknight rides I carry a few newtons in a baggy.