Don't eat so much matzah
Switch to whole wheat or spelt
Eat the matzah with something to help it go down easier: butter, cream cheese, jam, salami, egg salad, tuna salad, are all good choices
Exactly. You should measure out your kezayis before hand, so you only eat the exact required amount. By me, we all eat only whole wheat, it is a lot lighter on the stomach...
Eating the matzah with something, is a good idea, though, by motzi Matzah, you can't eat with anything, even salt.
My advice is to eat lots of fruit and veggies, especially ones with lots of fiber, they definitely help with digestion.
Avoid potatoes and potato starch they are also pretty bad
Uh. It's Pesach we're talking about.