I have endometriosis (had a hysterectomy in January for it) and I did have pain that radiated to my hip, and down into my thigh....but, from what you describe, you could have a hernia, or other kind of musculoskeletal injury from the lifting you are doing. You could also possibly have a pinched sciatic nerve and maybe need some physical therapy. I hope you can get a physical from your doctor and get a plan on how to get treatment...sounds like your son needs you to stay well.
I want to also say how wonderful I think it is that you volunteered to adopt a child with special needs. My nephew has CP, so I have some idea of your responsibilities. You are one of the angels on earth
