A pump from high rep deadlifting can seem very painful, but I've found that if I superset deadlifts with high rep db benchpressing the pump in my back is greatly alleviated. I guess you are diverting the blood elsewhere, and taking the pressure off the back. Here's what's worked for me;
set of deadlifts
incline db benchpress 4 sets of 25 (100 reps total inbetween deads)
PS use a very light load on the pressing, it should feel stupidly easy (10lbs per arm would be fine).
PPS I guess what your feeling now is just DOMS and to be expected.