Insanely increase in heart rate

Hi I'm a 20 year old male,not physically fit but nor am I over weight. I suffer from health anxiety and I struggle day to day with it. Last night I couldn't sleep to save my life I slept for 3 hours and woke up had food and went sleep after being awake for 5 hours for another 3-4hours. Baring in mind I usually like a 10 hour sleep with no interruptions. I recently had 2 ecgs which came back clear of anything wrong with my heart because I've had slight fluctuations in heart rate. My average resting heart rate is 60-70 and sitting is around 75 maybe more or less depending on how stressed I am. Anyways after I woke up for the 2nd time I made food and began to feel nauseous but not bad enough to be sick but it's mostly like because of how tired I was. Anyways I needed to go the shops which is a 20minute walk. My average walking heart rate is 120ish peaks up and down around that. Anyways as I was feeling really sick I didn't want to go but did anyway. Bare in mind I suffer from panic disorder and panic attacks quite regularly. Anyways I started to walk and I could feel my heart beating quite fast. I do usually notice it but it was quite fast for a change. I started to feel abit more sick and I know walking on a full stomach isn't good as it reducing blood to stomach which can lead to nausea and vomiting in extreme circumstances. I was walking for about 15 mins and my legs kind of felt of exhausted. I was already really anxious about walking because if how nauseous I felt prior. I checked my heart rate and it was 150 and I began to panic and it went upto 160. I sat down on a pile on bird seed bags and took my jacket off and tried to chill out. I had symptoms of an anxiety attack but I'm not 100percent sure. It was 160 for a minute of sitting down as I was really stressed. In a few minutes it was 130 as my mum was comforting me and then I always like to read the symptoms of a panic attack on the web. Even though I know the symptoms reading it helps me over come it more quickly. Anyways after about 10 minutes I began to feel abit better still abit nauseous like before but my heart rate was around the 90s. I called a taxi and got a lift home and within a few minutes of lying down and doing deep breathing it was in the 70s. And I felt good and relaxed. Is this cause for concern do you think or do you think it was panic attack mixed with feeling sick and a raised heart rate from walking while feeling ill which caused an panic attack? Thanks for any helpful reply

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