Would abdominoplasty be out of the question for me? (Photo)

Your procedure must be planned individually around you.  If weight is an issue and drug related, the first thing I would do is speak with your doctor precribing prednisone and Enbrel to consider alternatives that will control your symptoms as well or better without causing weight gain.  I would also find out what your dietary and exercise habits are, and why.  Losing weight will not resolve all of your belly issues, but will help you be much healthier and happier with your body and your tummy tuck result.  You need a good physician-surgeon partner to help you because of the added challenges your situation presents.

Hello and thank you for your question. Based on your
photograph, you will be a candidate for a tummy tuck with liposuction after additional weight loss.  This can be done through a low
incision, all completely below the bikini line. 
The belly button can be designed to look natural and have no scars on
the exterior.   Your muscles can also be
plicated resulting in a flat abdomen. 
Make sure you specifically look at before and after pictures of
real patients who have had this surgery performed by your surgeon and evaluate
their results.  The most important aspect is to find a surgeon you are
comfortable with. I recommend that you seek consultation with a qualified
board-certified plastic surgeon who can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.
Harvard-trained plastic surgeon