i am 21 years old and 2 weeks ago had a severe case of viral fever (102 fever constant) when my blood pressure went down to 50/70. after that time i have been feeling very weak and tired and giddy esp while driving and exercising. I recently have developed a pain on the sides of my neck but do not have a cough or sore throat. im afraid i may have cancer. can i get a test done to check anyway. is the test very expensive. i would rather be sure than worry all the time