Cheeryface, stress can affect the sinuses as well, my mum also has probs more so when work is very busy and she is tired and stressed and a bit run down.
My DP would get pain in his head, above his eyebrows, made worse when you bend forward. Would also get pressure on the back of his neck.
When my mum has a bad bout you can tell by looking at her that her sinuses are playing up as she has a swollen area on her forehead, she would literally be bed bound with it, in absolute agony her face, head, neck etc
She also can never really blow her nose, it never runs.