Headache & Tremors. What this could be?

I have been having tremors and body shaking. My hands and legs shake always. When I hold things they too shake and that is clearly visible. This is there always and I have never felt like it is not there. I have headache on the left side, numbness over that area, and sometimes I feel like electric shock in that area. I have balancing problem too, when I turn my head left/right, immediately I feel like falling/rotating. I have weak bones and muscles, which are causing me feeling like extremely weak. Sometimes suddenly my vision gets blurred. I started doing gym, but there also as I am feeling weak, I am not able to continue it. Strength is also very poor, when I twist hand, it makes me pain, same with other parts too. Vertigo like symptoms. I am 26y male. Please advise what this could be?