Hey, you don't need any vaccine to go Bangladesh, unless you go and live in the jungle. Telling you from my experience, i go BD every year without any vaccine whatever and i'm perfectly alright.
But you should take care of your health. Start going to gym, run in the morning. If you feel hyper or tense, just run.
I used to have panic attack and my heart beat used to raise. Instead of having any medicine, doc told me to run. so i just ran and ran. Now i'm perfectly alright and running is my habit now.