No it's not Normal, but it can happen.
Did you change something in your Diet perhaps.
It can cause Gas/Bloating/Acid Reflux.
Get some Bragg's Organic Apple Cider Vinegar, and take a couple Teaspoons before meals.
You can put it in some water, or I just take it straight, it's Strong tasting, but it works................... JP
P.S.
You can find Bragg's online at Amazon, or at your Local Vitamin Shoppe, or any other good supplement shop.
Some Grocery Stores also carry it.
If it's just Gas, try some Activated Charcoal, all supplement shops carry it, and Drug Stores.