your leaves turning yellow at the bottom looks pretty normal Roob. they are very old leaves and they dont last forever! most folks i know just pull them off. some deficiencies like nitrogen do start at the bottom, but usually seen over a few nodes near the bottom, like first node yellows but the node above is also beginning to pale like the yellow is rising upward. your yellowing is all the way down and the last yellow leaves have nice green ones on the next node up.
however...
you either have, or have had, some kind of bug issue. the screenshot shows obvious leaf miner action and lots of other leaf spots throughout the plant says there may be other pest activity.
good luck