great post! I have just come off a 76 hour DF and I think you will feel really good afterwards.
I found at 72 hours all the little sharp burning pains where the body is breaking down damaged cells where going crazy, I had pains in my eyes - my sight has improved, pains in my testicles, my sciatica wasn't so bad as it is nearly 100% healed. My whole lower body had pins and needles though which became quite uncomfortable, but I'm sure it was healing it.
I love the feeling too, a relief from contantly feeding oneself.
i find I recover faster after a DF than a WF.
Not sure if 72 hours is too long at your stage, I admit though I'd only done 3 or 4 54 hour DF's before I did 76 hours, maybe i went too long, see my other post from yesterday!