Take 2 Motrin and walk it off.
If it doesn't resolve in 4 weeks and you have good insurance, someone might want to scan it...but I'm guessing you're in the military, so I'd be surprised if you got anything more than an X-ray and maybe a muscle relaxant, if the doc is feeling really generous. The differential for lower back pain is pretty large, yet supposedly 90% of cases resolve without complications.
Sadly, I'm not in the military.
Fortunately, I realized what it was. It's just been such a long time since I've done it that I didn't instantly recognize it for what it was. When I crack my back, I twist my spine from left to right. After the accident, I stopped doing it because 1.) I once accidentally twisted my spine too badly and it became mis-jointed because the spinal plates locked incorrectly when returning to their 'original' posture. I did it last night, right as I was laying down to go to sleep, so I didn't realize I had did it until I woke up this morning.
I tried self-chiropractic on myself (or what I know how to do safely) but it wasn't enough to entirely re-posture my spine, just ease some of the pain. I'm just going to have to swing by a chiropractor and pay out of pocket to have them do a readjustment session on my spine.
There's certain stretches and exercises that help, as silly as some of them may seem.
I usually do this one where you kinda put your hands on your hips and push your lower back forward while trying to keep the rest of your body from moving. It only takes a minute and seems to help.
Tried this out for myself and it hurt like a bitch while doing it but it felt a little better. Any other little stretches I can try?
I've been having issues with that recently too. It started with me because I injured my back and then, from then on, favored one side of my body. The muscles on the other side were less developed and were more prone to injury, so I started having sciatic nerve issues. As suggested above, routinely doing stretches can help a lot, especially if there is a muscular imbalance. If you have good healthcare, I also suggest you have a lower back x-ray and scoliosis survey done.
I am, currently, uninsured so I'm kind've sol as far as healthcare goes - At least for the next few months, until I can register for it with my job.
I know, for a fact, because doctors have already done a few x-rays on me in the past, that I have a minor degree of scoliosis but it's about midway up my spine. The spine protrudes a little ways.