Refeeding Syndrome

I am a bodybuiler and I did a cut diet for a competition in June.  Two days later I began working on my next competition in September.  I was cutting and retricting my diet up until August 18th.  I had two days where I ate normal food while I was moving my son into college.  Since that time, I gain a massive amount of weight suddenly, have abdominal bloating and distention, burning of the legs, severe fatigue, swollen fingers/hands (at least they feel swollen), All over edema and fluid retention, and severe constipation.  I have no appetite at al, and many other symptoms.  I have gained over 25 pounds since the 18th.  I have several things per the Nurse Practioner to get things in my gastro system moving.  Nothing has worked.  It got to the point where I went to the ER as my symptoms continue and my abdomen was burning.  They gave me a gallon jug of colon prep and that seemed to work but they did a CAT Scan and it resulted in severe constipation but no organ problems or obstructions, etc.

I believe what I am experiencing is refeeding syndrome as per the research from the internet.  I restrict and eat very clean 90% of the time.  Since all this weight gain and issues I have been trying to stay clean and eat well.  I need to know how to reverse this damage or what type of doctor would I see to address the physical/medical issues.  I am just really frustrated and need help.