You are welcome, CassWys!
IBS people that suffer predominantly from constipation, usually have constipation symptoms caused by specific foods that are being ingested.
Try to keep a food diary to see which food is making your symptoms worse and which ease your problems.
It is well known that gluten is one of the leading causes of constipation in IBS sufferers, so, you may try some gluten-free diet.
Increase the intake of food rich in fiber like fruits and vegetables associated with drinking plenty of water every day.
You may also consume fiber supplements that are designed to add bulk to the stool so that waste can travel faster through the intestines.
If you start taking fiber supplements don't forget to take it with plenty of water (fiber absorbs water).
Try to add fiber supplements and food rich in fiber in your diet gradually.
Otherwise, it may make your problems worse, especially feeling of being bloated and gassy.
Since IBS symptoms get aggravated during stressful periods, try to practice some relaxation techniques.
All best to you!
Marija