Hi there ~
I understand your concerns. If you have had addiction problems with drugs and sex, in the past you probably are a good candidate to go through rehab. I also believe that your recent weight gain is contributing to your breathlessness due to an associated exacerbating cardiac condition. I also believe that you need to consult a doctor who can help with medical problems as well as the addiction issues as your problems with addiction are exacerbating your medical condition. Consult a psychiatrist
who is also experienced in the treatment of substance abuse
I hope this helps. Take care of yourself and have a lovely day!