I used nystatin prescription powder and it helped quite a bit. 100% cotton underwear will also help with all types of rashes whereas nylon will make them worse (and spandex can aggravate the problem horribly).
Also, what you probably need is a mons lift (either in addition to, or instead of, a panniculectomy). A panniculectomy covers ONLY the removal of the excess apron of skin below the belly button but above the pubic area. In most cases, to get the panni removal approved it must hang down over the top of the pubic area. A mons lift, on the other hand, which is generally NOT covered by insurance even when you have pictorial and medical documentation of issues, pulls up the excess skin in the pubic area (and usually involves removing skin -- and the hair, BTW -- from the very top of the pubic area). If teh problem is truly that the skin that started out over the mons is hanging down too far, even removal of the excess thigh skin won't help.
I had the misfortune of also having a lot of excess skin there (in addition to the panni), and even when I had lost almost all the fat everywhere else, I still had some fat there. I had to have a separate surgery to do the mons lift after
I had the panniculectomy. My PS said it was the largest mons he had ever worked on.
Good luck, and even though it is embarrassing, be sure to have medical documentation because that is your only HOPE of getting the PS covered by insurance.