Hate to say it but I'm in the same profession you are and my doctor told me every cop he sees has lower back issues thanks to that super bulky gun belt. I would see a doctor and get a fresh MRI or at least x-rays. I have a fractured L-3 from 1985 and my right side hurts like hell on the bike after a while. Same pain I get if I'm in the car too long at work. Lots of stretching and walking and I also adjusted a leg length discrepancy with lemond wedges.