Over on the Tomato Pest & Diseases forum you'll find a long post called Problem Solver 2. Just use the forum search for that form if it isn't still on the front page. It is filled with links to images of the different tomato diseases. Browse them and see if you can find a pic that matches your problems.

Off hand it sounds like you have a fungus problem (the black spots) from your description but I can't be sure without seeing it or a great many more details. If that is the case then spraying with an anti-fungus spray such as Daconil (sold under several different names) will help control it.

The purpleing leaves and veins are due to stress - normal for a stressed plants - and will disappear once you ID the other problem and treat it.

Good luck.

Dave

Here is a link that might be useful: Tomato Pests & Diseases forum

Thanks Dave, but I forgot to mention that I already checked Problem Solver 2.
Here are some pictures (sorry, I had to take them on my laptop so the quality isn't great)

Tomato spot problem

The leaves have started curling upwards- visible in the pics. I am diagnosing this plant with about 5 different diseases in my head :)
If I can't figure out what this is by next week, I think I'm going to pitch it... for my own mental health.
boo.

Could this be spider mites? It looks similar to the black sludge they sometimes leave on plants.

Don't pitch it. If you do you'll never know what problem you have and might have the same thing again in the future. Instead, take a sample of the plant to your local cooperative extension office and let them tell you what's wrong and what to do. Pictures can sometimes give a lead to a good diagnosis but hands on with a microscope is far better. Good luck. Don't obsess too much.

Darcygarden;
I have noticed the same thing on my determinate plants growing in containers. Same black marks, leaf curl and purple veining. I have not been successful in determining what it is. The tomatoes that set the earliest are big and just starting to blush. The newer tomatoes seem to be stunted and stopped growing. (I know determinates set all it's fruit at once and then decline, but the later tomatoes are abnormally smaller than they should be). So I was wondering what became of your plants and if you found a diagnosis? I am also growing other varieties of indeterminates that are not showing this at all, although I should mention that they are in a different party of my yard and planted in the ground. I'm beginning to think it may be a mineral deficiency~ it makes sense that they would require more fertilizer?