I have shortness of breath when i lay flat and use a pillow to help prop my head up. i am 21 and 300 pounds and was wondering if i am likely to have congestive heart failure or if it is likely the weight which i am starting a diet for?

Contributing: Obesity-hypoventilation is of concern as in time invariably strains the heart. You should start a weight loss program under the supervision of your doc. Other acute conditions cannot be ruled out with limited history available.

Agree with Dr. P: It is imperative that you lose weight. Joining a support group like weight watchers may help. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get HPV and Covid vaccines. Wish you good health!