Read my signature, I have bipolar and crohns disease too and am also possibly facing a MS diagnosis.
Each illness can be maintained. With bipolar you need to keep in very close contact with you pdoc and a theraist and always take your meds.
With Crohns you need to keep in close contact with your GI and take your meds too.
You need to be consistent with both and contact you doctors immediately if things get out of hand for you. You meds will be changing depending on what is happening to you in your life; diet, stressors, etc.
They are life long illness so you have to find a medication plan and lifestyle change that fits you.
Good luck. Keep posting if you have more questions.
There is also a crohns forum that you may want to check out as well. Go near to the top of the page where it says: Forum Quick Jump and click on the arrow and go to Crohns Disease.
Best wishes for wellness.