Stomach Infection Again and Again.

Since long i am having stomach issues its around 6 months now earlier it was stomach pain, bloating, semi digested motions. Three months back abdominal pain, cramp, mucus in motions, frequent motions, dr said its infection, given treatment for infection after some time again same issues dr said infection again infection treatment. 3 time done infection treatment not taking outside food taking bislery water. Now since friday again little pain in left side of stomach, cramp, non solid motions, drymouth and throught, extreme weakness, again visited dr he said again infection as i had a sandwich of Haldirams. I dont know what is happening to me since 4 month i am avoiding outside food as well. Whether it is possible to have Infection regularly? What should i do? Whether allopath is only option as they give antibiotic again and again. Or Homeopath or Ayurveda ll be better ? Dr saying that no need for test everytime problem is due to infection as my stomach become sensitive now.