Anxiety/panic attack or existential crisis? :(

I felt very anxious about death earlier today. At 3:00pm my sisters invited me to go run on a hill and I felt really exhausted and had no energy but agreed anyways. We picked up my cousins and her friend and felt a little distracted. Then we met another of my cousins friend at the hill. We walked/jogged on the hill for about an hour, I was very relaxed and a little exhausted but I was thinking that life was beautiful and that I should enjoy it more and live in the present. We finished walking/jogging and then we dropped off my cousins friends at their house and went to jamba juice. I wasn't having any anxious thoughts. Then one of my sisters and my cousin wanted an energy bar so we went to nob hill and my head started hurting a little, when we were in the energy bar aisle, I started thinking about god, our existence and I started wondering how the human race started and had an anxiety/panic attack. It doesn't even feel like an anxiety/panic attack it feels more like I'm losing my mind. I start blurting things out but not usually. I just wasn't thinking straight, today. It only lasted about 30 secs. I'm feeling like myself again but my head is hurting. I don't know if it's because I haven't been eating well or because the walk/jog on the hill gave me a headache. I think I've gotten headaches after exercising. (Of course, not always but it's happened before.) I've never had a headache before a panic/anxiety attack so I don't think the headache has anything to do with it. I'm not feeling as depressed either.

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In times when i am not depressed, sometimes especially stressing make me feel anxious about death. Is a strong and short pannic attack but i can deal with.

it sounds like you have been doing some deep thinking.

would you care to tell us what "answers" you have come up with? I think this could help us to help you.

Yes, I think way too much about things. I don't mind telling you or anyone but sometimes I'm too scared to go into a lot of detail and influence anyone's thoughts in any way.

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I fully understand. I will simply say Gods blessings to you.