Could i have a brain tumor or is it just anxiety? how can i know for sure?

Check symptoms: Anxiety itself is not necessarily a symptom of a brain tumor. You need to see if there are other symptoms such as unilateral(one-sided) weakness or numbness. Other symptoms include vision problems(blurred or double), nausea/vomiting, headache or seizures. In other cases, there are specific tumors that can cause memory/speech problems or hearing problems. An MRI is ultimately the definitive test.

Talk to your doctor: Short answer is that only a physician who is examining you can determine whether this is anxiety versus a tumor. The surefire way to diagnose a tumor would be some form of radiologic imaging, such as a ct or mri. However, your physician will ask you certain questions that might help determine whether imaging is necessary.