why has there been put a limit on how may questions that I can answer per day. this has never happened before.?

That is just a glitch making it seem like there is a limit.

There has always been a limit (at least since April 2012 I think), but it is so high that you probably never reach it. At level 7, you can answer 160 questions in a day. That is a lot.

However, there is a glitch on here today that makes a message say that you reached your limit when you really did not. Just hit refresh a few times and that should go away.

Not only this but the glitch says that I cannot ASK any questions. Come back tomorrow or earn some more points. But I have plenty of points and I don't need to ask questions.

It's been at least a couple of years since level 7 members had no limit, although high there has been a limit the last couple of years. Right now, it's just the Yahoo glitch du jour stopping you from answering. refresh the page and you should be able to continue answering. Check the link.
https://answers.yahoo.com/info/scoring_system