Cant type in 1.6.1

I can't scroll/type!!!And sometimes not able to click on things/ Screen Glitches up sometimes
Scrolling: I can not scroll through my maps, just sends me back to the top
Scrolling2:I can not scroll through my servers
Typing: Can not type anything in chat
Typing2: Can not type in creative search bar
Clicking: Sometimes i click on (example:)Singleplayer and it doesnt respond to it
Screen: It flickers