Lately My Head Has Been Jerking In Its Own, Mostly

Lately my head has been jerking in its own, mostly when im feeling something (annoyed, mad, etc) or it happens at random. Barely, but sometimes my eye twitches and/or i squint or scrunch up my face. Sometimes thers violent jerks, like one time i jerked my head and i blacked out for a second, then my neck started clicking afterwards. Do you know why this is happening? Do I have something? This has really been disturbing my school work since I’m used to writing sloppy and everytime I write something over the line like when I’m taking notes my neck starts jerking. Please help.