1000 calories is nowhere near enough if you're a working individual, your weight can fluctuate dur to hormones and age its normal. Eat the normal amount and focus on being physically fit instead of skinny.

I can understand how you feel but starving won't fix this, you will end up gaining more weight back. Please eat properly.

Noooo!! Don't stop eating all of a sudden!! I don't think I can say I've been exactly your position, but I've been in a similar situation. So I kinda do get it. I understand that you've been skinny your whole life and this sudden change in yourself isn't making you happy, but there's always room for being better. Again just know you are perfect the way you are. I know saying it won't make a lot of difference, but just trust yourself. You don't need to live up to the standards of other's beauty, you just need to be truthful to yourself and be satisfied with what you are doing with yourself. If you feel comfortable with the way you are now, then ditch what others think about you. You shouldn't be guilty cause you are eating. Eat what you want to eat, if you are feeling guilty then maybe excercise and work out equally so you won't feel guilty. It's not good to stop doing things you love just cause of insecurities or change happening within you.