No, not unless you happen to be severely allergic to one of them and die of anaphylactic shock. 400mg of tramadol is in fact within the daily therapeutic limit and those benzos, depending on what they are and how much is in each pill, will also either fall within the therapeutic range or are just a bit over. Yes, opiates and benzos and alcohol in combination will potentiate each other's CNS depressing effect but it will take hell of a lot more than the daily max dose of them to kill yourself.