Oh Lori I am so sorry. Sending many prayers for your dad and family . I hope he starts feeling better soon - I cannot imagine having a headache for so long
Hugs Lori...unfortunately I can imagine what your father is going through. I was diagnosed with the same thing years ago. My longest stretch was 3 weeks Thankfully my hormones seemed to have regulated my headaches/migraines when I was pregnant.
I wish I had some pearls of wisdom but as you already know, there isn't much of anything that can be done. There are some food triggers, etc...but for the most part it is a waiting game.
I had my first migraine at 25 - lasted a month and I wanted to die...actually thought I was. They are debilitating and come in so many forms. Your dad is in my thoughts and prayers...I hope that he can get some lasting relief soon.