Last year, I planted a tomato plant from seed, and it did not have any problems. This spring, it started putting out new leaves and branches, when I noticed that the leaves of some lower branches were shriveling. Upon closer inspection, I saw some white oval egg-like specs underneath the leaves and I assumed they were aphids since my eggplant plants got an aphid infection last year. So I sprayed it with a store bought neem oil solution. After a week or so, when I didn't notice a change, I began spraying it with insecticidal soap. I now don't see any insects or eggs, but the lower branches still keep wilting.
I have attached a couple of pictures of my tomato plant.
I have been plucking off the lower branches that wilt, and at this rate, I feel like it will rapidly progress up the plant. Can anyone please help?