Hi , I'm so sorry that you're struggling so much. Getting diagnosed with IBS is hard, especially when you have no idea what triggers your symptoms. 
Have you tried keeping a food diary yet? I found that to be very helpful in the beginning. You can write down everything you eat as well as how you're feeling, and then track your symptoms to try and figure out any correlations. 
You could also start by cutting out gluten and dairy for a week or two, as these are common triggers for many people (but not all). 
I'm also going to share the following article with you: https://irritablebowelsyndrome.net/living/first-three-steps-ibs-treatment
Whenever I need to just start feeling better, I eat an extremely bland diet (like white rice and chicken) for a while.
Anxiety can absolutely trigger symptoms all on its own, this always happens to me!
Here's an article about it that might interest you: https://irritablebowelsyndrome.net/living/gut-brain-connection
I recently started doing hypnotherapy for my IBS (just using an app) and it seems to help a lot with that.
I hope this helps!
Wishing you quick relief, Karina (team member)