Typical symptoms following gallbladder removal can range from gas, nausea, diarrhoea, and constipation, to severe pain every bit as bad as gallstones.
Causes vary. Milder symptoms are often simply due to the change in the timing and quantity of bile supply to the intestine. Your body will adapt slowly, you may be able to help with diet modification, but ultimately some people need drugs too.
Similar but more serious and persistent problems may involve disfunction of the sphincter at the end of the bile duct. This causes continuous dripping of bile into the intestines, instead of a release triggered by food. This is often mentioned because it is a specific known issue that can be treated, for example by surgery but it is not that common.
Severe pain similar to the pain of gallstones may actually be due to gallstones retained in the bile duct. This usually manifests quite soon after surgery and can range from mild to life-threatening. Treatment is often surgery to remove the stone, although it can sometimes be treated with less invasive means such as endoscopy, shattering, or dissolving drugs.
Different types of pain may be due to surgical adhesions where connective tissue develops between organs that should be free. These are common following any abdominal surgery although modern techniques reduce them greatly. Although the type, timing, and triggering of this sort of pain may be different from retained gallstones or digestive discomfort, you can't always diagnose the cause from the pain itself. Your body may also adapt to the adhesions over time. At your stage, internal wound pain can still be sonidered to be healing although you should get severe pain looked at.