Wendy, you can take vitamins, and they will help, but there is some question as to how much we can absorb from pills. If you can only eat salad, I would vary some of the things you put in it.
Also, try making some salads from veggies...like the 3 bean salad with green beans. Check out the recipes in the forum here...there are a lot of variations. You never know you won't like something unless you really try it. There are so many different veggies with all different textures and tastes, I bet you can find some you will like. For instance, I hate lima beans, brussels' sprouts, and cauliflower (in general). But I have found that I actually like broccoli and asparagus. It took trying them a lot of different ways before I could get to like them. You know?
I wish you luck!