Spaghetti 
To dream of seeing or eating spaghetti implies that you feel trapped in a situation involving someone else. It's possible that you want to move on but aren't sure of which procedure to use. This issue is making you feel awkward.
Ambulance
This dream may also represent your concerns regarding your well-being, or it may mean that you have become afflicted with an illness or injury. In addition, you should take great pains to evaluate an important aspect in your life.
To see an ambulance full of wounded passengers denotes your apprehension of discarding previous beliefs and feelings and replacing them with alternate ones. You are influencing others with your negative thoughts and emotions. In addition, it could indicate that you should reassess your choice of acquaintances. They may be affecting you in a negative way.
To dream that someone is hit by an ambulance suggests that you are carrying emotional wounds that need to be healed.
Casserole
To dream of a casserole indicates the forming of a wonderful, life sustaining idea. To dream that you are removing the casserole from the oven is a further indication that the idea is about to make itself clear and there may be great benefit if you put this idea into action as soon as possible.
Vegetarian
To dream that you are eating a vegetarian meal may indicate that something is missing from your life.
Alternatively, a dream in which you become a vegetarian may represent attainment of balance and harmony with the world around you.