Was this too much to eat if I am on a diet?

1,000 cals is not way to much for you. The lowest you are supposed to go is 1,200 calories. That's for any body weight. Your body is probably rejoicing for the fact it's being fed so well now. Your doing fine :) If you are worried, take a swift walk for about 30 mins, but don't over due it. you sound like you've eaten pretty healthy.