Are headaches and irregular heart beat connected in any way and what does it mean?

Im going to try to give as much information as I can and not leave anything out because I am pretty worried. I'm 19 Early this summer I got really sick with strep throat and went to the emergency room for an irregular heart beat, it went from 98 to 151 in seconds. After a shot it stayed between 120-134. Nothing less sometimes a few beats more. They called it tachycardia and didnt look into it any further. Every since then at random times I have irregular heart beats, mostly when I am sick. For the last 3 days it has been constant! I cant sleep because I hear it pounding really hard in my chest and I can hear it in my head. My heart feels like it flutters, sometimes even feeling it pulls against the muscles in my stomach. The headaches are bad, they are at the very tip of my head (where a hat goes), not the side, not the front, not the back, a little on my neck from time to time though. It feels like I have been sitting upside down for hours it lessens and worsens. Mostly at night I break out in cold sweats. When I cough it hurts and outlines the pain worse on the tip of my head. I dont smoke, i dont do drugs, i dont drink, im not depressed/stressed, no high blood pressure, no diabetes, its not a sinus headache, and im pretty sure its not a migrane. This is different, my dad blows it off and says its your sinuses! your congested! and gives me a BC powder. (BC powder fixes everything with him) I do have mild asthma but it is not bad, ive never had an attack and it never bothers me unless i inhale steam or cig. smoke. I can breathe fine through my nose, I can not take a deep breath because it hurts, every so often I do cough up a little flem. If it makes a difference it only really hurts on my left side, like under my lungs, ribs, kindney area. Everyone thinks im just "sick" I believe its more. Any advice on what may cause headaches and irregular heart beat that hurts from time to time is appreciated. Sorry it was so long but I wanted to give enough detail.