Don't eat it more than once a day. Clean your teeth properly after you eat or drink anything. Get you teeth x-rayed to determine the extent of decay. Get your cavities filled accordingly with or without root canal treatment.
It could be decomposed blood coming and or severe liver disease/kidney disease/hemolytic anaemia.
Please do a urine test - routine and culture immediately.
Based on the reports treatment would proceed
Take complete rest till the time
Take bland and healthy diet only.
Eating chocolate and chocolate cookies makes you fat and is totally unhealthy. You may consume a small chocolate bar once in a while. Chocolate facial is good for glowing skin, try that in a nice salon.