I do some hiring and we offer either whiteboarding or a take-home exercise, because of this exact situation. Anyone that you would enjoy working for would proba

I do some hiring and we offer either whiteboarding or a take-home exercise, because of this exact situation. Anyone that you would enjoy working for would probably provide accommodations if you told them in-person whiteboarding gives you anxiety. Also, we generally use whiteboarding as a way to understand how a person works, if they are on the track that's good enough. I would focus on getting better programming in general, by doing it, study interview questions for whatever you are interviewing for, and then try to take the pressure off yourself. It's ok to have imperfect whiteboard answers and the stress of the situation can make it harder.