Hi and welcome! As others have said, treating Crohn's can be tricky. It depends on the individual and the severity of their disease as to what treatment is best. To put it simply, there are basically three levels of maintenance treatment. The first level is 5 ASA's. There are many brands (Pentasa or Lialda for example), but they all are an anti-inflammatory used for mild-moderate cases. The side effects are typically minimal if at all. The second level is immune suppressants. These do, as you'd imagine, suppress your immune system so it stops attacking itself. There are side effects with suppressing your immune system such as infection and so forth. The third level are the biologics (Remicade or Humira for example). These are considered the "big guns" for severe cases. Side effects of these drugs can be scary, especially when cancer is listed. However, the risk is very low. And for most, these drugs have been a miracle.
Sometimes people need a combination of treatments to gain remission. Unfortunately, sometimes drugs lose their effectiveness, and people need to switch treatment. Also, people may need steroids or antibiotics to address the inflammation and complications associated with Crohn's. Needless to say, it can be tricky to figure out what works best for you, but there are many options these day.
I hope you find the best treatment for you, and you start to feel better soon.