Hi GMody everyone has different triggers for ibs, some people it's food or anxiety. For me it's usually stress induced and bad diet (couple of days eating wrong things sets it off.)
Things you can do to relieve some of the pain are heat packs on the stomach. The deep breathing will definitely help with both the anxiety and helps to get things moving. Another important thing to remember is to drink at least 2 litres of water a day. Going for a walk will help your mood as well as your digestive tract. If you can't go for a walk, on those days try doing some stretching exercises (should be able to find some online that will help).
Lastly and I can not stress this enough, if you body feels like it needs to go, don't hold on, go as soon as possible. This will help. Learn to listen to your body signals and follow them. If you ignore your digestive tract it slows down and causes more pain.
Want to congratulate you on going to therapy. Really hope the therapist you have is beneficial. So brave and you are doing awesome. Well done for reaching out for help and looking after yourself.