Hello. I'm really glad you're feeling good at the moment but as the others have said I would recommend being careful. Your doctor schedules tests and check ups at specific intervals for a reason and messing about with the timing can have a much bigger effect than you realise. Even if your crohns is stable you need monitoring to make sure that the medication isn't doing any harm to your liver or kidneys and that you are not becoming deficient in any vitamins amor minerals. I know it is difficult being sick when you're young and getting in the habit of working around it but you really need to. Your college should be understanding of the need for medical appointments and I'm sure they would rather you take the odd day here and there for a visit than end up needing weeks at a time off because things have gone down hill.
Here in the UK rescheduling appointments without a good reason is frowned upon and they can remove patients from waiting lists if they do it on a regular basis. I don't want to sound harsh but think of it this way, you will have crohns for life, at some point or another you will have no choice but to go to an appointment when you have study or work, it will be impossible to reschedule things around your career forever and if you aren't taking proper care of it all you will end up in a much worse position. Putting things back by a week or two while you go away or have a family emergency is one thing, but setting appointments back by 2-3 months at a time can really upset things.
As for your gi being annoyed, they will be professional and if you explain the circumstances will probably try and accommodate your needs but they may have a bit of a talk to you about the importance of keeping on top of things and prioritising your health.
