Lower back pain but MRI normal...

Anyone have lower back pan but MRI normal? This has been going on for a few months. I’ve seen my dr and have done anti-inflammatories and prednisone. I have also taken it easy on my workouts- I workout five days a week and I haven’t been lifting more than 10 pounds. I did the MRI but it came back normal so now my next step is physical therapy. Anyone else in a similar situation? I want to start lifting more weight but at the same time I’m scared that maybe my doctor and I am missing something and I don’t want to make it worse. My pain is worst in the am and night. At night my left foot goes numb or tingly and during the day I get sharp pains that shoot down one leg. Some times the pain stays right around my tailbone. Other times my back is just really stiff. Right now I’m not taking anything cause I finished the prednisone and meloxicam and I don’t want to take the muscle relaxers cause I feel like those just mask the pain instead of treat it