For any of your longer runs (such as the 7 miles or longer) .... Easy to digest foods that are long slow burning fuel like red potatoes or sweet potatoes or red mashed potatoes are good. They are easy on the stomach, have potassium, and are a long slow burning carb. Oddly enough, this is what I eat for breakfast on my race mornings 
I even got some others hooked on this. If you don't like to cook and you want simple, you can get those simply made potatoes that are microwaveable (that's what I bring with me to the hotel for races, or have morning of race day for a half marathon or triathlon). I've also done sweet potatoes (when I'm in home just doing a local race). But don't do anything white. No white pasta, no white potatoes, no white bread (well... actually on occasion I've done the white mashed, but I've read the white is more of a fast burning carb which isn't good).
Now, I know you don't want to eat potatoes everyday before you run, LOL. BUT ..... it's a good recommendation for your longer runs. You just can't fuel yourself on a gu or 2 for a long run, or you won't be doing any good for your training. You want to build lean muscle mass, so look up slow burning carbs for alternative, and then have some protein and smaller amount of carbs post run.
I'm not a nutritionist or trainer, but I've received a ton advice from my own nutritionist I've used who is a Pro triathlete.
If you are not a big fan of my potatoe recommendation, here is a Livestrong link on slow burning carbs you can read through for some ideas. You'll have more energy if you try to stick with these for the 90 minute prior meal. http://www.livestrong.com/article/331564-list-of-slow-burning-carbs/
I'm an evening runner also. I used to have some of these same issues as well but I eat about 85% Paleo now and don't have as many issues. Here is a good article I found about Paleo diet for runners http://running.competitor.com/2014/04/nutrition/is-the-paleo-diet-the-right-choice-for-runners_52363