At 59 with mild-mod copd, can I expect progression to severe level?

 I just learned this week that I have mile -moderate copd. I am 59 male, healthy, 20 lbs overweight, fev1 70-80. co98%, treadmill test 14 minutes  with heart rate at 195. I am really scared especially since I have a 13 year old daughter who I have sole custody of. I quit smoking over 2 years ago.  I have read well over 100 websites, countless blogs, etc in an effort to learn.  Will I eventually need oxygen or can I reasonably "expect" to keep the level down "forever" if I follow medical advice?  The Anxiety and shame I am experiencing is uniquely different than anything I have ever experienced in my life. My daughter is a high level ballerina and we discuss well being, proper diet, fitness all the time. Now I feel like such a hypocrite. Sorry for the babbling. The questions in my mind are like a faucet which I cannot turn off.  LT