Op you have my sympathies it’s horrid you are lifting and moving please see a physio and google and research your QL muscle, it’s a super deep muscle that spasms and will get triggered when lifting or moving.
once it gets into the habit it will flare occasionally, but there are some really good stretches you can do between any issues to get right in and strengthen the area around it, and more specifically if its on the right it will mean you need to strengthen your left glute or left side, it’s basically picking up slack somewhere in your exercise and getting itself knotted up. It’s most common on the right as we tend to be right dominant so the left is weaker.
it’s incredibly painful if this is what you have as it actually shifts the pelvis up slightly so will be impacting on so many parts of your back, hips bum, legs.
if you can find a very gentle physio, if you have any that practice the Hendrickson Method this will gently rock the area stretching and easing out the spasm, I’ll see if I can find the method as you can do some of these moves at home.
So google this: hendrickson method stretches for QL muscles and YouTube has so many methods and recourses that will help.
in the meantime if you can heat pack, or ice, my physio used to say ice but I used to find heat worked better for me, so went do the heat route.
in the meantime I’d go strong pain relief, codine and if it is that muscle you won’t be able to exercise through this tomorrow it’s agony and I’ve spend may times shuffling to the toilet, and that’s all I’ve managed.
keep us posted but I’d say stay clear of osteopathic treatment for now unless you know it’s skeletal, start with some physio.