Yellow, Shrivelled Leaves.

Hi
Total newbie and having a fucking nightmare!
My plant (big bud) is 4 weeks into veg, was looking great until last few days, the bottom set of leaves are now yellow, shrivelled up and look like they are going to die.
This has all happened really quick.
The top lot of leaves look good but its the lower set that look terrible.
It's in soil and my last feed on Thursday was 500ppm, i threw in a tea spoon of epsom salts (not sure why), could this be why they've turned yellow and wilted?
Apologies as i have no camera to post pics.
Its 11inch (the plant not my cock) lol
Please help a brother!
 
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