Judging by some of the responses here there are a few fliers who are not hearing the warnings to go very very cautiously, lest you too become a victim.
As far as the assessing of your fitness to fly, your DAME, your DOE (ophthalmic) and all other prescribed examiners who give you the once over, these are the examinations that are the prime determinants as to whether you are fit or whether you have something wrong with you. If your DAME is up to scratch he will know if you are not fit to fly.
Anxiety should not be a part of your days and weeks leading up to a medical.
For many it is, even when a ball of health. There is enough posted here to confirm the diagnosis of severe bureaucratic malaise.
On another tack, concerning the handling of stress, it is of increasing importance that everyone who feels that stress is affecting personal health adversely , actively seek remedies. Cannot stress this too strongly.