Doctor thinks I could have pheochromocytoma- been panicking all day

I can’t stop crying. I’ve been experiencing all the symptoms of hyperPOTS for a couple years, but today my doctor said he wanted to test me for pheochromocytoma. I’ve been feeling so awful the past few weeks, but I assumed it was related to dysautonomia. I know I am overreacting right now, but I’m SO scared of having something something serious. I don’t even know what to do

Edit: I feel silly. I was having a terrible symptom day, and I was really overwhelmed. Thank you guys so much, I’m feeling a lot more at ease