Quote Originally Posted by Mr. Clandestine
You should definitely check to see if it's rootbound, which judging from your pictures could be a possibility. Also, get a good handle on your pH if you haven't already, because some of the scorching on the lower leaves makes me think something is locked out. There's a troubleshooting form in my signature - fill that out as best as you can and you should get more tailored recommendations.

Take care. :jointsmile:
I agree With Mr Clandestine. It looks rootbound (the roots have used up all the space in the pot) Carefully transfer it to a bigger pot, and for the first week give only 1/2 strength nutes. I promise your plant will do better!