Hello! Losing weight with health issues

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I have been using MFP for 5 months and have lost almost 10lbs. I am obese and have asthma , PCOS and diabetes. A non weight related health issue triggered me to see an endocrinologist where I was diagnosed with PCOS. I have gained 70lbs over the past 10 years and 30lbs in the last 8 years. The first weight gain was after a car accident. Was put on steroids for an extended period and gained about 15lbs a year. The pain from the accident is still with me today but I wont let that stop me from working out! I have a treadmill at home and would like to purchase an elliptical machine in the near future but gave myself a goal of losing 30lbs before getting the elliptical. From personal experience ellipticals are much easier on my bad knees than the treadmill and b/c of horrible allergies my outside time is limited at the risk of an asthma attack. i do try to walk twice a week during lunch though. Thanks so much for reading a little bit about me. :)