you should definately talk to your doctor, I had symptoms very similiar to that, I would always get really sick, chest hurts, tired, hurried heart rate, when I'd get nervous it's flare up even worse and made me weezy and the doctors just thought it was my diabetes (type 1) weakening my immune system. well I ended up getting a chest x-ray and they found a mass or spot on my lung. it turned out to be valley fever(it's an extremely common illness in dry places like NM, AZ, and other states in that region)about 60% of the population has it, but most don't even know it because it never progresses far enough into anything, unless you have an extreme case (which is rare, so you might not even have what I had). this is going to sound gross, but it's pretty much fungus growing on your lung. well the doctors gave me diflucan and they didn't think much of it. I had been getting a lot better and x-rays showed it had gone. (that was about three years ago).
This October one night I started to have these severe chest pains in my left lung and the same symptoms as you have (tired, even just walking up the stairs makes you feel winded, chest pains, getting sick very often, panic attacks, hurried heart beat ) so my 'rents rushed me to the hospital, when we got there the docs took x-rays and didn't see anything until they went and did a CAT scan then they found a pretty good sized cyst on my left lung (cyst-like a tumor, but not cancerous and is a sac usually filled with fluid). they recommended me to a pulomnologist and sent me on my merry way. the pulmon. decided the cyst needed to be removed but because of its location (it was rubbing up against the lining of my lung membrane) it would be a difficult surgery and I was gaurenteed to have promblems with my lung later on in life. so i left and she said she'd call me in a few weeks with a game plan.
two weeks later I got really sick with the stomache flu and my chest pain started flaring up more than usual. then it got to the point my chest was in so much pain i couln't bend down or lay down or sit in certain positions. there were shooting pains in that lung that almost felt like i was having contractions there.
get to the ER, they take x-rays and tell me the cyst has burst inside my lung and my lung had collapsed (btw I'm sorry this is so long, but your symptoms sound like what I had and I don't want anyone to ever have to go through that)
all right so they drugged me up on morphine and for two days I was passed out until the docs decided I needed emergency surgery.
what they had to do was make three incisions inbetween my ribs and one in my back, when the surgeon got into my lung, he said it was bad, there was greenish yellow chunky puss everywhere and it had become infected, so they scraped it all out and when they finished scraping it out they found a rather large hole which they cut out the skin around it and pulled back the rest of the tissue (shrinking my lung, yep I've got a gimpy lung now
) of the lung and stitched it up, next they inserted a large tube into one of the incisions through my ribs to drain all the fluid that had leaked into my lung<--that was gross and painful I was attatched to some stupid suction machine for two days.
all right, so the doc sent in the puss for a culture. turns out its the fungus, it was living and it had never gone, away and the docs hadn't detected it with the x-rays, not until 3 yrs later did they figure out with the CAT scan it was still there. right now i'm back on diflucan to kill off any left over living cells, they could easily come back again and do even more damage than they've all ready done, the docs have told me that this is something I'm going to deal with for the rest of my life, and I will constantly have to come back for check ups.
so anyways here's my point, make an appt. with your doc right away because if you get that^^^it's not exactly a trip to Disneyland, also if they decide it IS something wrong with your lungs and the possibility it's valley fever, insist on an x-ray AND a CAT scan. BUT I'm not a doctor, that ^is just what happened to me, its not even very likely you have that..