Does IBS ever go away? Or are your symptoms there pretty much constantly?

Depends on cause. There are many causes that may include: stress, hormones, infections, inflammation, structural to name a few. Best is to work together with a gastroenterologist to arrive at the correct answer for you. Everyone is different and there is not one straight approach. You may start with as simple as an elimination diet and record which foods may aggravate you. Best wishes!