Hi, I am 25 and I was diagnosed with Crohns back in 2007. I took Azathiprine when the other drugs didnt work, unfortunately it didnt agree with me but not everyone is the same! I understand where you are coming from, it's a scary thing to have (crohns) and with the treatment available there will always be a side effect, but if you leave your crohns untreated it won't go away it will only get worse. If you find the Azathioprine doesnt work for you there are more alternatives. I am starting a new drug next week called Humira which is a TNF Blocker, where I will be injecting myself at home, unfortunatley I have tried 5/6 different treatments for Crohns and so far none have agreed with me so I am hoping this new treatment will work. I am also anxious about starting this as there is a risk of severe infections due to being an immune suppressant but that is a risk i am going to take because I can't handle the pain anymore. I hope the Azathioprine works for you and that you will be ok. Just remembe, everyone is different, and if you do find that this drug doesn't work for you, your gp/consultant is there to help and will find you other alternatives. Unfortunatley there is no cure for crohns but with medication and the right diet and some lifestyle changes it can be controlled.
I hope this has helped.
Best Wishes