I believe it can be genetic too. My grandmother had it as do my Mother and 3 of my siblings.
Mine is fight or flight and impending doom along with worry over nothing. Restless sleep, insomnia and a poor appitite.

Current meds are :

Zoloft 100mg and 4 mg of Diaazapam for sleep.

I fought it for over 15 years without meds then I finally had to do something for it in March after my Doctor nagged me for 10 years.