That back pain may be anything from a ligament/tendon, muscle, nerve or disk problem. It really does not take much of an effort to damage any one of these. Give it some resting time (prefer a couple of weeks) before doing any serious compound leg work. Leg extensions, or even sissy squats, should be OK for now. Try some heating/cold pads on it or a good sports lotion/rub.
Some American think NHC is the answer over here. Wild about the socialized medicine thing and all that. With 320 million Americans (and a under estimated 20 million illegal's from Mexico alone) it would be way too costly to handle. Unless we want a tax level like England and Sweden, which seems to be drawing mounting concerns to their whole national structure...going broke.
Our great white neighbor to the north (Canada) has a socialized system but with a much smaller population base. But it is still a hurry up and wait process. Seeing a medical professional may take months in advance. People in Canada who can afford it, come to the U.S. for any emergency treatments or operations. Even the Arabian oil sheiks come over here for operations (using quite a few Jewish doctor by the way). A lot of the uninsured here, that people running for elective office are shouting about, are illegals who should be back in their own country anyway. Looking for the U.S. free lunch..... again. Good Luck.