Medical Question Please Help!?!

Hello. So I often have what i'm pretty sure are panic attacks. I get hot sensations going through my body, i feel like im going to faint, I have a HUGE fear of dying or having a seizure during this. (just so you know, my family does not have a history of seizures and neither do i. i have never had a seizure.). I don't know what it is for sure. The doctor said it's all in my head, but these are real physical symptoms. Now I have heard that Hypoglycemia is linked to panic attacks, and eating a non- sugary snack while panicing will help this. This works for me, that's why I think i may have hypoglycemia. I think my fear of seizures while having my panic attacks comes from me knowing that hypoglycemia can cause seizures. I also occasionally see a little sparkly spot in my vision, and sometimes i see weird kind of sparkly diamond-like patterns when i wake up. My panic always starts anywhere around about 8:30am to 10:30am while i am in school, and lasts anywhere from about 10 minutes to like half an hour. Fresh air and snacks help. Now i have been having some additional symptoms recently. Starting in the past couple of days, I have been having pressure in the top and back of my head. It feels like my head is closing in or something. I am also experiencing muscle aches and small but noticeable pains in the pressury kind of spots on my head. What do you think this could be? I'm really really worried. (my worst fear is having a seizure, even the word scares me). I would appreciate your help very much.