What can I use for bloating if I don't have a doctor?

Over the counter med. Bloating is often related to specific foods. Avoiding those will help, but there are a number of over the counter medications available for bloating due to gas. Almost all contain simethicone. If you have avoided gassy foods and your symptoms persist you should see you doctor for evaluation to rule out bowel disease or other causes for your symptoms.
Gas-X. Of course, there are many different causes (some concerning and many not). Persistent symptoms warrant evaluation by a medical professional.