Your feet swelling is not a good sign..... I had that. You are putting a strain on your circulation system and heart with all the fluid you are retaining. (I'm not a doctor, but had this happen to me!)
I know about "drug holidays" but I believe those are for people who do not abuse their pain meds. IMHO, once you are taking them for the "feeling" and not pain relief, you cannot go back to them without risking getting seriously and more intensively hooked. I tried to tell myself I would be OK if I reduced my tolerance. Ha ha. But maybe it will work for you, I don't know.
At any rate, I wish you much luck with whatever you decide to do. I would strongly consider help with your detox. Cold turkey is not fun.
Ashley