Back injury is nasty stuff, very serious indeed, but the body can and does heal it. What often happens is people feel better then go on to re-injure the same injury site, and repeat the cycle, over and over, sometimes for decades.
If it is disk slippage, the body sees that, then swells up the tissue in that area to push the disk back into place, and then swelling declines once everything is realigned. That usually takes at least three rather painful days. The swelling will not decline until the disk is properly realigned. Swelling puts pressure on the spinal cord, which can feel like pain from almost anywhere in your body, as nerves from elsewhere are passing through the region that is under pressure. For example, your feet can hurt, even when they are completely fine. Burning sensations, tingling, itching, stabbing pains, etc, are all indicators of swelling at the injury site.
You can sometimes speed this realignment process with a helper. Lay flat on the floor, on your back, with both legs straight in the air. Then, while keeping your belly flat, relax your back with your helper slowly pulling your feet back toward your head. It can take several minutes for the tendons in your spinal cord to relax and let go, but eventually your spine will relax and it will lengthen, like in any other stretch, giving an opportunity for a slipped disk to slip back into place. If that works you will receive immediate pain relief. Think like a dislocated shoulder. Same principle at work here.
Good luck. Back pain is fucked, and it really fucks with your life. Get better, and get your life back.
I recommend swimming as your best exercise while you are healing, to strengthen your back with minimal gravity pressure on the spine. After you get better, add walking to the mix. Walking is nature's best method for strengthening your skeletal structure, by literally pounding and cracking the bones, with your body repairing and rebuilding them every night with fresh calcium. If you can put in a couple of miles a day for two months, your back should be in pretty good shape.
I would not do any further lifting for a while. You want the opposite of that, aka, not lifting.
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