There seems to be a little confusion here - Early (and Late come to that) Blight only affects plants in the Solanaceae family, so peppers, tomatoes, that sort of thing. It would not spread to other, unrelated plants, so your curry plant and parsley were not suffering from this infection.

Second, you must dispose of the soil in the pot, and sterilise the pot thoroughly before refilling with clean soil and growing tomatoes again. Keep the tomato plant away from your other potted plants, as far away as possible, it might help, it might not, because the spores of Early Blight live on in the soil, and may already be present in your other potted plants, though not affecting those particular plants. Spores also arrive on wind and in water droplets, so to some extent, Early Blight may still be an issue in succeeding years. Link below gives information to try to prevent or manage this fungal infection


http://www.ext.colostate.edu/mg/gardennotes/718.html