I went to crank my car and it clicked when I tried to start it. It has done it before and I can move the battery cable and it will crank. I had the post tightened thinking that would prevent it from not cranking. It still did it and I got it to crank although it was hard to move the post. This time it just clicked continuously and then went completely dead. Now it is no longer clicking and my key is stuck in the own position and I can't get it out. What could be wrong?