My daughter was relieved, too, to finally be diagnosed correctly. At least, now that you know, you have a chance to find out which treatment works best for you. Entocort works best for patients who have Crohn's confined mainly to the terminal ileum...if you have it anywhere else, Entocort will probably not work.
It did work for my daughter, and the full effect was felt within weeks...the FDA-approved protocol is to use Entocort at 9 mg (3 pills) for up to 8 weeks to induce remission. And then, assuming symptoms are gone and labs look OK, it is not only OK, but optimal, to use Entocort as a maintenance med, at 6 mg (no more and no less), for another 12 weeks. Clinical trial results showed the patients who sustained remission the longest were the ones who, in addition to using it to induce remission, stayed on it for another 12 weeks.
If it works for you, Entocort is a great med for buying time to consider which route you want to try: diet, other meds, etc. BUT, as for long term maintenance (years), it is not recommended for two reasons: 1) it has not been proven to cause mucosal healing, which means you might look and feel OK, but the Crohn's is insidiously causing damage in your small intestine which, over time, can lead to strictures, surgery, complications like abcesses, and permanent inability to absorb enough B12, and 2) over time, it will cause the same effects prednisone does: loss of bone density, raised blood sugar, eye pressure, etc.