Pain in neck. Necks veins or whatever!

Hi. So my sis put pressure on left side of my head. Though I didnt vomit or anything. I had pain there. And suddenly since a week I have this pain from behind the neck and also behind head down till my scapula and my hands nd fingers also sometime. I always sleep on my left. And there is pain sometimes and sometimes theres a lot of stiffness. Click click voice comes when I rotate my neck. After massage it feels a bit better. But when I wakeup idk if its because of stress or what I feel internal trembling and also external. Is it because of some spongilitis or smthng i use pphone a lot. That too in neck bent position. And i used to use a pillow thats too hard n high. Theres no swelling near neck. Just that only left side its stiff i can rotate my neck bt click sound comes nd sometimes i feel normal bt when i travel its like it triggers. What might be thr reason. Pls help m scared if its some tumor or something near my left side if necks veins or whatever