Abdominal Pain..

Do you remember when you would wear pants that were way too snug or something that was binding or you had to hold your stomach in because you felt uncomfortable?  Then afterwards you would just be sore in your stomach and ribcage area....  I feel like that constantly lately.  My clothes are looser than ever.  I don't have to hold my stomach in BUT I am hurting.  It's just a constant dull ache.  Has anyone else run into this?  I asked a nurse friend about it and she said it was probably just my body adjusting to the huge changes and maybe I am carrying myself differently.  I don't know what it is, but I want it gone.