Why Do I Feel like This At 22?

For the past few months I been really tired all day everyday no matter if I sleep 8 hrs.or 12 hrs.Throughout the day I get brain fog and find it hard to focus and feel kinda woozy especially when in a store with alot of people and bright lights.I also get out of breath and my heart beats really fast just from everyday stuff like getting up from the couch or walking up the stairs.Also when I check my bp at the store its always really high like 140/100 and my pulse is always 80-100 bpm.but as I sit there for a few minutes everything goes down to normal or sightly above.I am taking a beta blocker and it is not helping at all!!! I been to the ER and they dig a EKG,urine test,blood work and a chest x-ray which didnt show anything at all!! I went to my doctor and he just gave me a anxiety med which makes me more miserable and tired.I also got tested for everything under the sun like lupus,thyroid,diabetes,vitamin deficency ect. I also got a stress test and echocardiogram and halter monitor but that was over 2 years ago.I am only 22 Dont drink and Dont smoke!! I have high cholesterol and high triglycerides but the doctors just told me to take fish oil which has improved my number and I had Vit.D deficency but I took a supplement for 8 weeks and my numbers are normal.I am not depressed but not being able to live a normal life is making my feel down and is stressing me out and causing a bit of anxiety/panic.I also worry too mucha nd I am a bit of a hypocondriac from it all.I also get tons of pressure/tension headaches.I been to a few different doctors and a few different hospitals and I cant seem to get a answers...............PLEASE DONT SAY GO TO THE DOCTOR BECAUSE I BEEN THERE DONE THAT I AM JUST TRYING TO SEE IF ANYONE HAS ANYTHING SIMILAR???