Any advice welcome at my wits end !!

I’ve always suffered with IBS since I was diagnosed around 16. After the diagnosis I suffered a few flare ups here and there but nothing on the scale like I have been suffering for nearly 3 years now. I still had a quality of life.
It all started when I went out for some drinks with a friend 3 years ago. I ended up in hospital as I couldn’t stop being sick for 24 hours couldn’t keep anything down. They did some tests and said I had gastroenteritis. Anyway…