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Pain in my leg joints & bones.?

I was having weakness in one knee (felt like it was going to give out when I walked and numbness on the upper side on my back (also left side). I had an MRI of my back and brain (fearing MS). My back was fine but my brain showed a spot on the right side but the neurolist said it was most likely a scare and didn't think it was anything to worry about. He did test my Vitamin D levels and it was low so I was put on supplements. The symptom went away so I stopped (I hate taking pills) and it came back within a few days. I've been going through cycles of taking it (and other vitamins) and not. Over the past 5 weeks, I noticed throbbing pain in my other leg. It started in my ankle and hip and I felt it when I was sitting. The pain has now involved my knee and shin and the numbness in my back has returned. I have a job where I mostly sit so it's getting painful to work now and for the past two days, laying on my side has been painful and actually has been interfering with sleep.
Has anyone else had this happen?
Do you think it's the vitamin D or something else?
If it's the vitamin D, why do the symptoms come back when I stop taking it? I now drink milk (which I didn't before when all this started) so I'm wondering if I'm able to store vitamin D or if something is causing me to lose it? I know a thyroid problem can cause problems with vitamin D but my thyroid test came back normal last fall.
I still young but I feel miserable.