About two days ago, I had coffee throughout the day. Later on in the evening, I started feeling my heart beating faster than normal (kind of like palpitations). Yesterday, I felt very fatigue and got really hungry after work and I still had palpitations. Today, I felt pretty tired and I just feel so strange, I can't pinpoint it. I thought maybe it was intestinal but I didn't have much urine today either so I thought maybe I was dehydrated.
I feel like I have a really high body temperature too but no fever. Also, I feel slightly sick to my stomach. I am a healthy 25-year-old female, 5'5" and weigh about 110 lbs. I also have a crush on someone right now too, so I don't know if it's physical or emotional. What could it be?