Can someone offer some advice on yet another back strain scinario?

i had a back strain from running in track and it was nothing at the beginning but then it got worse and worse until i could barely walk without feeling pain in my back. i went to a physical therapist and we did a lot. i used these thermopack heating pads that are these 8 hour lasting portable heating pads. i also used icy hot CREAM, not gel. the gel doesnt work at all. my physical therapist also gave me this thing called a tens unit, which worked the most for me. there are 4 electrodes that go on 4 different spots on your back and they send shocks that actually relax your muscles. it pretty much mages your back, and it feels great afterwards. i recommend that the most. but good luck!