Stabbing pain in feet, probably something worse or anxiety ?

Hello everyone, 

so I need your honest help. It might be a long post, but I will appreciate your answers. I found some good posts on this forum so I though I would check it out. 

I am 18 years old male, and I probably have hypochondria since the age 14. I fainted from hyperventilation at the age of 15. I thought I would stop worrying about my disease but I did not. I "had" all kinds of cancers. 

However, about 2 months ago, I developed a lump on my buttocks. I thought it was sarcoma. The lump went away obivously, so it was a bite or an ingrown hair. But since then, I keep getting this pins, stabbing pains in my foot, and stabbing in my leg, which sometimes can be felt on my pelvis. It was accompained by knee pain.  It started at the same day I was observing my buttocks for my sarcoma, I grabbing my foot a lot, so I can see the lump properly and also wear Nike Rosheruns (they have a bit higher sole). I am saying this, because maybe I damaged my nerve. I was mainly focused on the knee pain, as I thought I developed osterosarcoma of the knee, but I still felt the sensations in my foot. The funny thing is, they somehow got away for about week, when I went to our summerhouse, then went we went to our vacation for another week, and I only got occasional knee pain, but I think the foot was ok. Then I came back, and I started getting the sensations again (I wore the high nike shoes the whole vacation). I googled muscular dystrophy after, and thought it is my muscle getting weaker or something. I think these sensations got better again, as I was focused on another symptoms. Went to test my creatinine levels, and figured I could not have muscular dystrophy, but then I remembered there is still the ocassional knee pain and foot stabbing. I thought I would have osterosarcoma of the foot, knee of back. But today I figured these are the symptoms of multiple sclerosis, which hit me quite hard. The stabbs are the only symptom, but I do get dizzy sometimes when I stand up (The dizziness have been always though, even before the 3 years I fained - I had EEG done) The pain is weird though, I feel I honestly get it only, when I am not moving, and it gets better with movement (maybe because I forget about it ?) and I is always there when i remember it should be there. Yersterday I was focusing a lot if I feel it in the other foot too and slowly started feeling it there. Today I feel the stabbing there quite regulary (but still less than in the left one). I can still feel the stabbing in the whole left leg though. It goes through my thigh, sometimes calf, the knee pain is better but still there sometimes. I also started feeling little stabs in both arms today. 

Something about me: I spend a lot of time infornt of my computer, bad posture, workout (no weakness felt), wear shoes without any special inserts, sometimes go running. These infos might help with your diagnosis maybe. 

So I wonder guys, could these by anxiety, ms, cancer ? Mabe lyme disease because the lump I had was maybe an infected bite ? Sorry for the depressing post, whihc might be confusing, but I am depressed out of my mind. I waste a lot of time a day worrying about diseases. 

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