Thank you for putting up your problem to Healcare Magic!
The tubes can re-canalise years later and can result in pregnancy
and testing the pregnancy with home kit- the Urine pregnancy kit is a house hold procedure so I would surely advise you to go for it.
Another possibility is a gastritis
You should get a check up by your physician- Get CBC, RFT, LFT.... and then follow the advise.
It appears as if you would only need H2 Blockers for some time.
I hope this information would be both informative and helpful for