Hi Liza,
While you say Doctors don't rx for PCS here, check out this site:

http://www.nhs.uk/Conditions/Concuss...lications.aspx

Your Depression, irritability, Anxiety are all symptoms which NEED to be treated - even in the short term - by Therapy or meds - before they become rooted and develop into a greater problem. Others here will know more about your condition and the particular use of Migraine meds mentioned.
Don't be fobbed off with no treatment when help is needed and available. Speak to your GP.

Dave.