Holy Heartburn Batman

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Hey ladies!  First time Mom here.  I'm just over 4 weeks and getting used to all the weird things going on with my body.  I know I have a long way to go.  
I was wondering if any of you have tips for dealing with heartburn?  I have the worst heartburn of my life right now.  I've taken Mylanta but it did nothing.  I ate a banana too because I heard that helps but it didn't do much.  Any tips at all would be helpful.  I'm not sure exactly what I can take.  
Thanks!