I completely understand, and it's not pleasant at all. We can feel like prisoners in our own home. But what I hope will happen is that your dietitian will be able to help with some good suggestions for managing your diet and IBS, It may make such a difference, so it's worth going to see them. I wonder if after your first consultation, they might be able to do Zoom or Skype calls with you for appointments further down the line?
I hope your diet management works well for you. There is some hope at the moment, so stay positive as much as possible. Wishing you well.