Talk to Psychiatry on Brain Tiredness And Headache

I have severe brain tiredness, mental fatigue, brain fog, and a feeling of burnout almost all day. I can't concentrate, focus, learn new things, or remember things properly. My memory is very poor, and I feel mentally exhausted even without doing anything. I also have a heavy, tired, painful feeling mainly at the back of my head and scalp, sometimes with back pain. These symptoms occur together and affect my daily life. They happen around 20–25 days a month and get much worse in winter. I sleep 7–8 hours but still wake up tired. Exercise sometimes gives slight relief. This problem has lasted 6–8 years. I have tried different antidepressants without significant improvement.

What could be causing these symptoms, what tests or examinations do I need, and how can I find the right treatment?