Heart problems at 17 and doctors don't know what's wrong!?

I'm a 17-year-old female who follows a vegan diet and exercises about 6 times a week. I drink about 2-3 litres of water a day and eat the most out of everyone in my family (however I am mindful of what I eat). Because I am active, my resting heart rate usually sits between 60 - 70 bpm.

On Tuesday of last week, I had a panic attack (my first and only one) because of stress I'd been under the previous week. After that, my heart rate stayed elevated all afternoon and late into the evening. The next day my heart rate was elevated again and I could feel a burning/aching sensation in my chest. My heart rate was 87bpm in my first class, then 91bpm in my second where I began sweating and experienced shortness of breath.

On Thursday, my heart rate got so high in my 4th-period class that I became short of breath and began to sweat quite badly. I was experiencing such discomfort that I got up to go the bathroom twice, being unable to sit still. It was horrendous and I ended up texting my mum to come get me. That night, after the heart rate remaining high for about 2-3 hours, I was taking to see my GP. An ECG was conducted, however, nothing irregular showed. My pulse was at 95bpm to 97bpm and my blood pressure was elevated. I was sent away to get blood tests taken.

On Friday my nose started bleeding in class while I was sitting completely still and feeling no emotional distress at all. The same elevated heart rate and shortness of breath occurred during the next period and I was sent home.

During the weekend I developed back pain and chest pain, especially when lying down, and started finding it hard to get comfortable at night when I was relaxing in bed. The pain even extended across my shoulder blades and up the back of my neck a few times. 

On Monday, I lost my appetite. Unusual for me because I have a rather large appetite and never even lose it when I'm nervous or stressed. I'm more of an emotional eater. 

On Tuesday, I visited my GP again who gave me iron tablets and ascorbic acid tablets for an iron deficiency detected in my blood. He told me that it was very unlikely that an iron deficiency had caused my heart to act this way because (according to older blood tests I never got results for) I had always had low iron levels. I had a chest x-ray done, then I was sent away to do more blood tests. Both of these came back normal.

On Wednesday, I began experiencing chest pain and shortness of breath in class, then when I stood I got pain all through the back and sides of my head. I was very lightheaded and thought I was going to faint. My parents picked me up and I was taken to the hospital, but after 4 hours of talking to nurses and doctors and waiting, I was sent away with no answers provided. My pulse was at 107bpm and my blood pressure was once again elevated. The blood tests they did came back normal and so did the ECG. They were saying it could be something along the lines of stress or anxiety, but really they didn't know what was wrong.

I've been having bad headaches and lightheadedness since. The symptoms are still persisting.

I've been booked in to see a cardiologist, but that could take anywhere up to 6 weeks before I get in.

Just a note that despite me never experiencing anything like this, there are heart conditions on my mum's side. My grandma has angina. My grandpa had a triple heart bypass. My mum and her brother have an irregular pulse. My aunt has a tear in her heart.

Has anyone experienced this or knows what could possibly be a cause?

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