Sorry to hear about the crohns diagnoses for your son. How old is he? I hope he is feeling okay after his operation. The diagnoses of IBD is a big learning curve. I hadn't even really heard of it or understood it before my sons diagnoses. But you will learn and it will get easier.
My son is now 14, he was diagnosed with crohns at 8 years old. My son is on azathioprine and Pentasa, and now having Infliximab infusions every 8 weeks.
On the whole my son's life is no different to any other child's, apart from the amount of meds he has to take and blood tests he has to go through. We have had ups and downs over the past 6 years, but he does really well.
Usually once you can get onto the right meds, life is so much better.
PM me if you want to chat, I am in the UK also. xx