Anyone taken tramadol? Help!

Today I got diagnosed with a really Nasty kidney infection I've been in so much pain, my doctor gave me antibiotics I then asked her if there's a stronger painkiller she can give me as the codeine and paracetamol arnt taking the edge of whatsoever so she prescribed me tramadol at a lose does for obvious reasons because I'm allergic to all anti inflammatorys but I'm really really really worried about taking them they said it can slow breathing down and stop you breathing as well as other scary ass life threatening side affects has anyone tried tramadol and can put my mind at ease or shall I just soldier through the pain and not take them??