My side is killing me!

Sara
OMG ladies! Is anyone else experiencing this? My right side, right below my rib is in constant pain. It feels almost like I've severely pulled a muscle. My doctor thinks it could be one of my babies pushing on my rib mixed with constipation...or my gal bladder. I'm thinking it's the baby's head lodged in my rib because I'm in pain when I go to bed and when I wake up. Walking just makes it worse. I can massage the area and get a bit of relief but as soon as I stop it hurts again. I cannot get any relief. I'm 25 weeks along and am due in Dec. I don't know how I'm going to make it that long :(.