I too have the same problem and sometimes I feel sad on rainy days. I know this is because of PTSD in my case. Because when the sun left me, I begin to remember those horrible incidents that happened to my life. This has been a routine in my life. My therapy for PTSD is going well; that's the reason why I still have not committed suicide. My therapist [link removed - see member for content] gave me more confidence and gave some tips to overcome fear. He also advised me how to handle situations with more courage.