It has not been that long since major surgery. If you still feel this much pain call the doc. If you are not eating and drinking normally you may not have any....pooh or urine. You may have some sort of other infection, like a UTI. The issues you mentioned are not ones I have heard of but the doc went to school to gain his knowledge and I did not...lol.
When "I" had my gallbladder out with semi emergency surgery back in the older days, they put the instrument inside the patients abdomen and pumped air in to extend the area so they can see all the parts around the gall-bladder. They do their thing and close the few tiny incisions. After that the air that is still inside has to work it's way out and it can collect in different parts of the body cavity and then slowly dissipate. This can take days. That may be the pain you are feeling.
There is no telling as to how long it will take you to heal. I had 22mm stones that would roll around and block the duct. They would then move around and open it up later so I would have intermittent pain. The doc saw me in the ER on Friday evening and he had plans for the weekend so he but didn't want to do any surgeries that were for non life threatening issues. Surgery was scheduled for early Monday morning. I went in, had it done and was back at work on Wednesday, or Thursday.
I never took more than 1/2 if a Darvocet for pain and that was just because hubby made me take it to prevent pain the afternoon of the surgery. I did not need a strong pain med. I was just uncomfortable.
My sister, on the other hand, had hers out and it ruptured as they were taking it out. They had to immed. open her up and started cleaning out her body. She ended up nearly dying from this. She lost weight down to about 85 lbs, she had just had a baby a few months before too and had some baby weight still left on top of her normal weight. They thought she was going to die due to blood loss and infection. She is a Jehovah's Witness and refused blood transfusions, without one they called everyone in to tell them they didn't think she would pull through. There were several times over the next few days that she seemed to be dying but she did pull through finally. So, her gallbladder surgery story is much different than mine. The point is that each and every person is different. Age, activity level, general health, your personal usual healing time, all sorts of things come in to play when your body had such a violent thing going on inside.
You will heal on your own time schedule but I would call the doc and tell them the pain is getting worse on the right side, you are not peeing anymore, you have not pooped, etc...these are warning signs that something else may be going on, perhaps another CAT scan would show a blockage or some pocket of air that is stuck somewhere.
PS, after I had mine out I could drink OJ and eat anything I wanted for the first time ever. I would be sick for days after drinking OJ, burping it up, acid indigestion, etc...same with greasy stuff. After surgery I no longer had those issues. I did not have to go low-no fat at all. I could eat like a normal person.