You say you've had Crohn's for a year, the first year or so is often the hardest as you're still adjusting to it and your 'do's and don'ts' etc.
I don't know if you'r registered with the disability service at your uni, I'm at uni in England and here we have a brilliant disability service, they helped me with stuff such as getting extra equipment (such as recording equipment for when I feel I can't write notes in lectures) all students here with a chronic illness are given extenuating circumstances when applied for so you can get an extra 4 weeks on deadlines for when symptoms etc mean your struggling to get work in and an extra try at exams and assessments without the mark being capped if you felt you couldn't work to the best of your ability, I spoke to my lecturers and seminar leaders about my illness as quite often I can't make them especially if they're early in the morning or when I have to take time out to go to appointments etc. and they all looked out for someone in the lectures who wrote lots of notes and asked them to make photocopies which they then gave me to as well as offering recordings so that when I miss a lecture or seminar I'm really thoroughly caught up and can do so when I feel enough. The disability service also told me it is possible to spread your uni year over 2 years so you do half time for 2 years rather than full time for 1 to ease the work load.
I have heard that students with chronic illnesses often take longer to complete degrees but there is brilliant help and support, if you decide to go home I'm sure they'd be happy to suspend your course for you to return to complete if and when you feel up to/decide to. It must be hard being away and dealing with this illness, I hope you find the support you need whatever you decide to do and most of all that you feel better soon!