Most Helpful Girl
You need to learn how to get all the things you were getting from meat from other sources.
Peanut butter is a good source of protein, as is kidney beans, most beans have decent protein levels. Also eat lots of dark green, leafy veggies for iron. Nuts also have lots of protein, so stock up on peanuts, almonds and walnuts. Have those in a salad or on top of your cereal with breakfast, or even store some in your purse for a snack.
You can also get protein shakes to help supplement your diet. I would suggest seeking out a dietician to help you. I know the internet is a great help, but it doesn't replace advice from a dietician. My bf's sister is a vegetarian and she was having the same issues until she learned how to eat properly as a vegetarian. I know it sounds weird, but there is a right and wrong way. You need to have a balanced diet because you must make up for nutrients not consumed by cutting out meat.
You may also have to take supplements, but that would be why a dietician is a good idea. They can get blood tests done to make sure you are getting enough of everything.