Blight?

Thanks for any help identifying what's wrong with my tomato plants!

June 22nd Garden

This is my first year gardening and I've become completely obsessed. So far, things have been going pretty smoothly. Since I have limited space and share a back yard with others in my building, I decided to make a container garden. I bought a Lemon Boy and Better Boy seedling to start in mid-May. Then after spending some time on this site, decided to try a few heirlooms, so added Cherokee Purple, Green Zebra, and Gold Medal a couple weeks later (Memorial Day), also from seedlings. In addition, I have a cucumber plant, bush beans, jalepenos, and an assortment of herbs. And because I'm out of room at home, I am growing a yellow pear cherry tomato on my balcony at work.
The Lemon Boy and Better Boy have both set little fruits, with the largest on each being about golf ball size. The heirlooms are all in bloom, so I think they aren't too far behind. The only problem I'm starting to have is curling leaves, yellow leaves, and some brown spots. I think the curling is due to aphids so I picked up some horticultural oil at the garden supply store and gave them a good spray. But I'm not sure what's up with the brown spots. The weather here has been pretty extreme over the last week (hot (90s) and thunderstorms) so I guess that could have something to do with it.
I'm very excited today because I discovered a stray tomato plant this morning!! It sprung up between the brick and concrete on our patio.