First off, BREATHE!!! I've seen worse in my own garden in the past with even some burning on the buds two weeks from harvesting!! I was a wreck, but harvested early and the smoke was great. Yours don't look anything like the particular grow I'm describing. How often are you feeding during flowering? At this point, you can feed less than during veg. Many people suggest flushing your soil if you think you have over-fed, but that could cause problems and even more burn depending on the type of soil you are using. Miracle grow has plant food balls in it and when you flush, it seems to release too many nutes into the soil and screws the plants up more. Just water without any food, and check out this page here at RIU:
Guide to Nutrient Deficiency or Toxicity
I had a small lightening of some leaves in my current grow and typically don't have problems during veg; all of my troubles typically occur during flowering when I am trying all kinds of stuff to get "bigger" buds, "faster"!! I've learned lots from those experiences. Nevertheless, check out that link as it helped me with my current grow and I rectified the little problem I was having really quickly.
Don't panic man, again ... I've seen MUCH worse!
Peace and much grow love
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