Blurry vision and vomitting after riding bike up a hill

Hi, I'm 20 year old female and I don't exercise at all so I would say I'm unfit. Yesterday I was out riding a bike and within the first few minutes, I had to ride up a hill. The hill wasn't too steep but I could feel myself getting out of breath, legs burning and heart pounding faster. As I reached the top I continued on riding but started to get blurry vision and it got so bad I had to stop and get off my bike. I quickly sat down on the grass and tried to breathe in deep to normalize my vision again. My vision was not getting better after like two minutes and then I suddenly felt like I couldn't breathe. Every inhale and exhale felt like I was breathing through a straw and I think I felt something funny happen in my heart but I don't remember. The breathing felt like my throat was closing as if I was having an allergic reaction. This only lasted a few seconds and I then felt a bit nauseous and puked a few seconds later. My vision went back to normal after puking and I felt fine after that. I haven't biked in three months, but I have rode up hills three months prior and felt out of breath but didn't have any of these symtpoms. Before, I had a big meal and went biking a few minutes after that and had no drink with the meal. When I was younger I have experienced blurring of my vision after strenuous exercise usually from running and have almost always puked after getting blurry vision but never had any breathing problems. I thought I was having a heart attack or allergic reaction to something I ate. I have had heart palpitations before where it feels like my heart flutters and then I feel like I lose my breath for a few seconds. Could I have unknown heart problems or was I having a mini heart attack? Any advice or ideas of what happened would be greatly appreciated, thanks in advance. 

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