Hello Friend,
I have looked over your pictures and have a few recomendations for you. I noticed that you are using a soil based enviornment. I'm sorry to say that I believe strongly that you have the dreaded spider mites. Please go through the following to confirm this.

When you turn over the spotted leaves do you notice microscopic black spots? I bet you will... check closer to the base of the leave.

I've noticed that the leaves higher on the plant seem to demonstrate a greater degree of spotting which is common for the spider mite.

In hotter more humid envriornments they will start to spin webs where they will lay their leaves.

I doubt that the wilting had much to do with this, its probably just a conincidence. However, it wouldn't suprise me that because the plants (like the human body) were weak, allowing the pests to grab hold.

Here is what you should do in order to get rid of them.

Get some SM90..... spray it every other day on your plants dosing them from top to bottom...... dripping wet is ok.....

I've included the link below to SM90 so you know what to buy..

GL

SM-90 Pest Inhibitor from 4 hydroponics.com by Growco Indoor Garden Supply