toki

So my tomato plant was dying and I transplanted it out of the container, thinking it just needed more space and it was coming back but I noticed there were bugs all over it, so my Grandma told me to spray a mixture of dish detergent and water on it, and I did that and it started to die again! So I rinsed it off with just plain water and tore off the dying parts but it's looking pretty sad right now...does anyone know if there's anything I can do for it? I love homegrown tomatoes...