I have severe anxiety problems too, which have caused a range of physical symptoms, including breathing problems (and I have asthma), stomach upset inc. IBS, false alarms with my heart, etc. I would suggest that you see a doctor as soon as possible to help not only with your anxiety, but also with the alcohol.
Another thing you should have checked out is whether or not you have sleep apnea, which can have an impact on a number of issues, including quality of sleep and breathing. I was diagnosed with sleep apnea several years ago and use a c-pap machine at night. I'm very overweight as well, and I find that I sleep better when I use this machine.
Speaking with clergy could help as well. Please keep us posted on how you're doing. There's strength in numbers!