I suffer the same pressure in a right temple for about 6 months. It started a long time ago when i first got my panic attacks. I've been treated with remeron and lorazepam after many months of suffering and feeling extremely anxiety related to stress at work lack of sleep and studying together. At that time i changed my lifestyle, my diet and added vitamins intake. As the same time i started experience difficulty with my breathing through a nose, approximately end of december. In about 2 months it's grown to a big trouble, the second big trouble that i live in canada and finding a good ENT is a challenge and long waiting list, in addition the doctor i attended did septoplasty and it didnt help, he didnt fix my spetum. In a present time i experience extreme pressure in my right temple with difficulty to breath through a right nostril, i realized that it's all related to sinusitis but here in canada it took a long time to discover it, my family did CT scan and told me that. As well i have a deviated spetum(my nose was broken one year ago), which wasn't fixed during septoplasty. And as i'm saying it causes problems. When i'm not tired and sleep well, i almost don't feel a pressure until i need to do tasks, especially it hurts at work. I have an appointment with good ENT in Toronto on 11,June(3 months waiting) and i bet he will help me out. Things which help to beat anxiety include remeron(mirtazapine), vitamins, tons of vit C, some antibiotics(amoxicilin) and vitamins and minerals under label Life.
So i think you might have a same problem and should pay an attention at your sinus, may be your nose was damaged long time ago. It can lead to very bad feelings, i had couple times emergency when i felt pressured too much and wasnt able to breath and felt apathy. As well i still not sure in my opinion, all i can add i had MRI last october and it didn't show anything but a little something(they said it is a little swelling or something) on a right temple and send me home(by neuropatologist). I'm still worrying and going to repeat MRI. If anyone ever had similar problems, don't pass this topic please.