What to do if i have seasonal affective disorder how can i fix it?

Get a full spectrum: White light (they are expensive) and sit and read a book in its light for about 2 hours in the early morning. This readjusts the normal brain rhythm known as circadian.

SAD: The most fun option for treating seasonal affective disorder is going to the Caribbean for vacation when it is cold back home. Light therapy can be very effective. Psychotherapy and psychotropic medications can also be beneficial. See: http://www.mayoclinic.org/diseases-conditions/seasonal-affective-disorder/basics/treatment/con-20021047