Want/Need to lose 10-15 lbs by fall. Son's wedding.

I have been overweight most of my life.  After I had my youngest son(17 yrs ago) I gained 80 lbs and never let go of them.  I have a twin sister and a sister 1 1/5 yrs younger than I.  We all had different medical issues due to our weight.  My twin sister had a horrific rheumatoid arthritis case, exasperated by her weight.  She suffered of athsma and sleep apnia, my younger sister (who is the reason why I considered and went thru with RouxY) was almost clomotosed her sleep apnia was terrible.  She would literally fall asleep standing up.  I developed a severe problem with my heart, as a child I suffered a severe case of rheumatic fever and consequently developed a heart murmur.  My youngest sister and I decided we would research and consult with a physician, we said, "if it gets approved, it gets approved"... ah, well, surgery was approved!  A year later, my twin sister had surgery.  We have all had 'little' things happen consequent to the surgery.  I had a tough time after surgery, dumped for months!  I went into congenital heart failure 4 months later and ended up having open heart surgery and requiring the implant of a pace maker.  UGH.!  However, the three of us have also had TT's and my twin sister had a breast reduction.  We are all very happy we made the decision to have the RouxY...despite the experiences we've had to go thru since then.