what's wrong with me

Hello, I'm 17 and things have been wierd for me for the past 4 months. I kept having tics - little repetative movements- which I acquired when I was 16. Now, they are hiccups, shaking arm, and knee jerks. The knee jerks result into a strange gait which can last a long time. My gait can be a bit stumbling like if I had ataxia. My wrist jerks which results in it failing and I drop what is in my hand. I wear a wrist splint sometimes coz it hurts. Now, I fall forwards when I sit, like a faint but I manage to pull myself up in time without bumping my head. Speaking of head, I get mild headaches frequently now.

Also, my legs have failed in the past week a couple of times, and I stumble to the floor and lie there for a few moments. No-one has seen me yet  but I'm afraid I'll do it publiclly and it will last longer. Would I need some mobility support if it gets frequentlike a wheelchair or crutches. I wouldn't be against it, but I don't know if I need it.

The surprising thing is these things are occasional, and they happen at random times. I looked on diagnosing websites and it's strange that these symptoms are like brain cancer or tumour symptoms. I really don't like the sound of it. I'd rather use a wheelchair than have the cancer. Could I have cancer?