It dosen't matter if your 220 pounds or 320 pounds, thats way way to little food, trust me eventually your body's gonna screw up so badly. Sooner or later your hearts gonna get messed up and you'll be on the verge of a heart attack, you won't be able to run anymore because your legs hurt so much whenever you even walk, cause your body's eating anyway at your musscle tissues cause your starving yourself, your blood pressure gonna screw up and your gonna get dizzy every time you stand up you might even pass out, you won't be able you take a shit cause your entire body's slowed down which then could lead to cancer....the list just goes on and on.
Try eating at LEAST 1500 calories a day not only will it give your metabolism a boost but you'll feel a hell of a lot better and you'll actually have energy for your exercise

and forget about all that low carb crap it's bullshit your body needs a certain amount of carbs (but don't be scared if you start eating some more carbs and you gain weight, cause carbs naturally retain water so drink 5-6L of water daily to minimize this, and if you do gain any water weight it'll go away eventually after your body reajusts). start eating some oatmeal, milk or soya milk, whey protein powder, 100% whole wheat breads/pita wrap/bagels/crackers, unsweetned peanut butter, more fruits and vegetables, fat free chesse, or light cottage chesse, more skinless chicken breast, tuna's good, theres tons of stuff. And for every time you eat some Carbs put in some type of protein to even it out.
As for your cardio, try doing HIIT cardio. Jog for 30 sec, then sprint for 30 sec. then jog for 30 sec. sprint for 30 secs etc. Do that for 15 minutes, then jog for another 5 minutes to cool down. If you want you can do this every day of the week or do what is recommended and do it 3-4 days a week.
As for the swimming, swimmings really good but you don't have to do an hour. Maybe do 30-45 minutes at most.
And also no don't stop exercising after you look good, exercise is part of a healthy lifestyle, just right now your going overboard with it, so once you think you feel good you can gradually cut back on all the exercise you do, just as long as you still eat healthy and maybe have 1-2 cheat meals/days a week.