Tomato Problem

I am new to this site, and new to gardening. I was hoping someone could give me some advice on what is wrong with my tomato plant. Some leaves are turning yellow, started out with light brown spots on a few leaves and now they all have it and are turning from brown to black. We did have some harsh rain and wind followed by a lot of sun and warm temps. Is this something that is fixable? Or should I get rid of it and start over?

You could try saving the plant by trimming all the leaves except the very top 1 or 2.  Some growers do this to avoid disease and improve fruit production, it is not a drastic measure.  Or pull the plant out and start over if you have a long summer.