oddball

Hello. A friend of mine told me about this website and suggested I ask this question. Right now, I'm in the reserve, and on the 2nd week of my annual training. Last week, during a field exercise, I was lifting something heavy and threw out my lower back, and they put me on light duty for the remainder of my AT. Someone suggested I should file a claim with the VA, however, this is not the first time I've hurt my lower back. About three years ago I did the same thing while at home working in the yard, it was completely unrelated to military service, and not an any orders, and I've received care at the VA since then. I'm able to get free care at the VA since I'm 50% overall between a few different things. They did an MRI, and I've been to physical therapy, and it was mostly manageable over time, and I haven't been in physical therapy for over six months. My question then here is: If I hurt my back three years ago, documented as outside of service, then will the VA grant service connection if I essentially re-injured it here while on annual training orders? I'm already service connected for conditions related to mid and upper back (rated as thoracic and cervical spine), and they are manageable through physical therapy and medications over the years. But this injury has been treated at the VA as lumbar spine, with some radiating pain down through the leg to the foot. I don't have any service connections for lumbar or leg conditions. My plan right now is to simply go back to the VA and tell them what happened to try and re-start physical therapy as I had been for the past three years for this issue. But I'm not sure what to do about VA service connection, or if that's even possible. Thank you