How severe can abdominal adhesion pains get?

Very severe. Abdominal adhesions will develop in any patient after any type of open surgery, in less degree after laparoscopic surgery. Adhesions can cause many problems, including bowel obstruction, bowel strangulation, severe abdominal pain. If all the workup for abdominal pain is negative and life style has changed because of the pain, then you should see a surgeon for surgical options.
Unknown. While many patients have abdominal pain and intra abdominal adhesions, some have pain and no adhesions, Dir have adhesions and no pain. It is usually a diagnosis of exclusion, and sometimes responds to surgical treatment (laparoscopic). Hope this helps!