What Causes Leg Swelling In A Person With Nerve Damage?

I have nerve damage, I have had a stroke, I have epilepsy, porphyria, hep c(i went thru the interferron and pegasas, My feet swell, because my viens are small. I also now have been told I have harding of the arteries and will probley have to have a by pass for my heart but the stiints would not work I would have to have the old fashion by pass when they take the viens from your legs. I also am a smoker(i know quit) and am oxygen 24 hrs, but I am really only on it a few hours a day. I have been on Morphine now for over 8 years the long lasting and the fast acting, however they don t seem to help my bone pain and my neck (cervical area)pain, according to my mri my back is bad but my neck region is worse. is there something better to use for my pain, I did try oxycontin at 80mg 3x aday and could not even get out of bed i was on that for atleast 5 years. please help, I know it is hard when you don t have my records, but I hurt so bad I can t stand it most days, I do push myself to do things so that I don t turn into a couch potato. please help!!!!!!!