Hello,
I just found this forum and think it's great!
I am having similar pain! I had my gallbladder out 5 months ago and was symptom free (except for 1 day, the third day after surgery, but I had assumed this was scar tissue or something).
Until about 10 days ago, the only "complaints" I had had since the surgery were general discomfort (not pain) when leaning forward a lot and slight nausea (I've never been a nauseous peron).
But 10 days ago I started feeling very similar pains to what you describe... it feels just like I did before I had by GB out... almost constant ache/pain in my upper right abdomen right where by GB used to be. And if I'm busy, I sometimes don't pay attention and feel a little better. I also feel better after a night's sleep but towards the afternoon, I get much more sore, even though I sit at my job most of the day. I also get much more tired than I ever have been (except during early pregnancy).... that has been hard for the doctor to explain. I do get a low-grade fever (99.4ish) most days, but it never goes higher.
These exact same symptoms appeared before my GB was taken out. I would swear they forgot to take it out or something except that I was symptom-free for 5 months.
So far, we have done blood tests (totally normal) and an ultrasound of the liver, kidneys, pancreas, spleen, etc. and they were all normal. I'm waiting to hear what the next step is and I'm very frustrated with being in pain, especially after reading this forum and all the people who spend years in pain. From what I've read, this could be a simple stone remaining in the common bile duct, some sort of problem with the bile duct (stricture or scarring or something from the laproscopic GB removal) or Sphincter of Odi dysfunction, which is mentioned here a lot. I have also been told to look into Celiac Sprue disease (gluten intolerance), which runs in my family. But I haven't been to or talked to the doctor since.
Hope that helps to know you're not alone!