Hi, I am experiencing a lower back pain for a while, right now I am sitting down and my left leg is kinda of aching mildly, its like a wavy ache that goes down to my knees or up to my pelvis, but only side only. I am worried this could be something serious, can you help me? additional info : I do birkram yoga, and I feel that it kinda of helps me a little but a few hours later my back starts to go sort of bad again. I had blood test a few months ago and ANA came back positive with 800 elevation and everything else was fine, my bad was in pain back then ( 6 months ago) I once stayed immobile for3 days ( 2 months ago) and that was horrible. I even took a pregnancy test because I was feeling so weird and even my belly would twinge, this afternoon I was sitting and for a few minutes the top left of my stomach under my ribs was in pain and that was very weird, I usually find it hard to rest my legs when I go to bed its like they cant relax. CAn you help me please? Thank You, Olivia Romao