Get a soil test…they aren’t that expensive through your nearest agriculture extension service.
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That looks a lot like septoria leaf spot, a very common fungus.
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I agree completely, and that is probably part of my problem, but after years of gardening in a central valley climate in Nor Cal, and keeping an eye out for the very common suspects, I also learned that some of the woes attributed to the common, and to senescence, might warrant a few other considerations, at least where it is insanely hot AND dry.
One year I had a fungus on a pepper plant, and realized just how unusual it was for me to have fungus problems here. Certainly it can happen, and you want to think horses before zebras, but I think we also need to spread information about spider mites and western flower thrips, at least in the this climate.
PS I went out and plucked most of the suspicious leaves after seeing your post!
FWIW: I see lots of possible ideas suggested here. My own first look was to think of overwatering leading to fungus, but there are certainly other options.
Regarding soil, I don’t think we’ve heard your exact mix as to its composition/brand. In the future, you might try the “soilless” mix that I and many others use: get a tarp on the lawn, and toss onto it equal parts of peat moss, coarse vermiculite (NOT perlite), and as great a variety of composts as you can locate (I usually go with manure, mushroom, chicken droppings, worm castings, and some packaged mixes.
The tarp, especially when you have a friend who can help, is a good way to mix up al this stuff by lifting at the edges methodically, raking a bit.
If it were just aphids, I’d say to get some hungry ladybugs. Not sure it’ll help with the other problems though. Any other friendly bug or pest eaters you can attract?
I do sometimes have green lacewings. I cant say I attract" them, but I certainly encourage them. So pretty! These are not my photos!
Adults Picture from Anatis Bioprotection
Eggs Picture from The Survival Gardener
Larvae Picture from Anatis Bioprotection
That would describe my prior attempts well 
But apparently tomatoes like me now.
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