First of all, try to stop stressing. It's hair. It will grow back. And you are more than your hair. I'm sure if you're wanting to model and are confident in that endeavor that you're quite pretty. And I believe hair at any length can be styled to look presentable. Go talk to a stylist: obviously one specializing in curly hair and with GOOD reviews (check this site and yelp). They might be able to cut or style it in such a way that it's cute at your current length and they also can shape it in such a way that it'll grow out nicely. If you don't know your properties already (how thick your hair is --coarse, medium or fine-- and how porous or elastic) it is you should find out because that's way more important than curl pattern.
Then you'll be able to choose products that suit your hair. Just bc your hair is short doesn't mean it should be frizzy or messy. What are you using to style now and what is your routine?
Finally, if you want your hair to grow back faster, the best thing is to take care of yourself, both physically and mentally. If you don't already, exercise at least 3 times a week to increase blood flow and oxygen. I've been taking hair skin vitamins that I think are helping. Drink plenty of water. A good eight glasses a day is the general rule of thumb. A well balanced diet that does not consist of too much white bread, red meat, or sugar. Get your omega-3 fatty acids so that whatever hair does grow in is stronger. Also might want to look into castor oil application to the scalp for hair growth. And although some people don't have a problem with them, I'd try and avoid silicones and sulfates for the overall health of your hair and to reduce hair loss.
You know a picture would be super helpful too. (You can white out your face with photoshop if you want.) Sometimes people think their hair looks awful but it actually looks quite cute. We get that a lot on the forum. I'm worried you say you can't eat or sleep because of your hair. Is there anything else going on in your life that might be inducing stress or is it just this? Because if it's simply your hair, well, here's what I do whenever I feel strange about my hair. I remind myself that I'm young and I'm blessed to even have it. I'm blessed that it's thick. And I'm blessed that it's curly. Besides, curly hair makes you look younger, it will give you an edge in modeling because it's more versatile, and, let's be honest, it's more fun.