SCARED TO DEATH! HELP SOMEONE! IM SO SCARED PLZ HLP?

I THINK I HAVE ANXIETY, I GET SHAKEY, NERVOUS AROUND OTHER PEOPLE, FEEL NAUSEATED WHEN I START STRESSING, AND BEEN TWITCHING! MY HEAD ARMS LEGS HAND LIKE A UNSTEADY FEELING SORTA AND FEET, NOT NOTICEABLE AND ONLY HAPPENS SOMETIMES. NOBODY CAN SEE IT BUT ME. DO U THINK I HAVE EPILEPSE, I AM A HYPERCONDRIAC TOO! I NEED SOMEONES ADVISE! DO I HAVE A BRAIN TUMOR? IM SO SCARED! :(