Thank you for posting your question here, I will try to answer it to the best of my abilities.
Have you considered having yourself checked for gastritis? As it would explain the nausea
, pain and bloating
. I may not be right, but i really do believe that the cause of your problems is related to your digestive system and not because of your irregular periods
So ask your doctor to check for signs of gastritis and if I am right he can start the treatment as soon as the results are back.
I hope this answered your question.