Hi Chantel2003,
I have a duodenal ulcer as well, I was diagnosed with it about 8-9 months ago now.
I was also put on Nexium and I took 40mg for 2 months and then went off it because I felt fine and thought I was cured.
I have recently been having all of the same symptoms again so went to the docs and he said I should have been on the meds for 6 months, so he has given me a new script for the next six months now, but 20mg tablets this time.
Hope this info helps.
cheers
Karen