Cancer?

I am a 24 year old Pharmacy Student, and getting a little concerned about my symptoms... am I just over reacting?
I have a hard, non-tender lump on the right side of the back of my head down towards my neck.  I noticed it in undergrad (4 years ago) and they took blood work.  The NP said that my white count (i think) was slightly elevated, and that i probably had a virus lingering around, which would explain the swollen lymph node on the back of my head.  It has never gone away.  It has been there at least 4 years now.  I have lately been SUPER fatigued.  I very frequently experience orthostatic hypotension (I lose eyesight for a couple seconds, i get dizzy, almost faint) if I stand up too fast--or even if I stand up perfectly slowly.  This happens AT LEAST twice a day.  This has become more frequent the last year or so.  My right lymph node on my neck is swollen. Definitely a positive lymph node on the neck.   A few weeks ago, I must have had a virus because I had a low grade fever for a good 2 to 3 weeks. I admit that I don't drink enough water. I used to be soo active (gym, study without problem, functioned on minimal sleep, etc.) Now I am really struggling. No fever now though. Am I just freaking out?


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