What side effects can develop from having bulimia (i'm not bulimic just wondering)?

See below. It can lead to chemical imbalances in the body as well as doing signficant damage to teeth. Bulimia can make your quite ill.
See below. Purging leads to the flow of acid back through the esophagus which causes damage not only to teeth but also the lining of the food tract. Mechanical problems like tears can also result. Passing out, abnormal heart rhythms or poor muscle function can arise from losing salts.