Not necessarily. Pheochromocytoma is very, very rare, but shares some symptoms with much more common illnesses that may or may not be dangerous, including panic attacks, hyperthyroidism, and some abnormal heart rhythms, among others. It takes a detailed history by a clinician, and sometimes blood or urine testing, to narrow down a diagnosis.
Probably not. The actual incidence of pheo is truly one in a million (not an exaggeration). It is a very rare disease. The symptoms you have are unlikely to be due to pheo. If it's a concern, a simple blood and/or urine test rule it out.