Hello, the flank bulge is as far as I am concerned because they having been messing around with your internal organs which fit together as a 3D jigsaw puzzle. The organs slide over one another in all directions while you move, breath and so on. In case the surgeon did not put the puzzle back in place but assumed it would fall back in place by its own it will take some time if not forever. The problem of you cut nerve is potentially affecting the ability to be moved back.
What you could do is get in touch with a (physio)therapist who is educated in Visceral Manipulation by Barral. He might be able to sort it out. Even though you have a injured nerve thinks might help also in case you have some digestive problems due to the surgery (think of Tummy aches, breathless ness and so on.
I would think that an ordinary physiotherapist would not do more than give you some exercises. In case the surgery has caused changes this might be futile....due to inhibition of muscles. Also a good idea is to seek help from someone who is trained in Strain- counterstrain. Again only few physiotherapist are trained in this technique (well to get on a real course you have to go to France, Canada or the USA you see.
Hope this helps.
Nb there is a Barral institute in the UK in Ayr Scotland which will be glad to tell you where a local Barral trained therapist can be found in your area. Personally I have good results (after 1 session) but expect that it all will take time before things are back to normal, otherwise you will be dis appointment.
You're a brave person, I mean to give away bodyparts.
Hope this helps