Any tips or tricks to help say words that start with B or P?

Any tips or tricks to help say words that start with B or P? So, my stutter is very much stress-induced and it's sometimes impossible to even make a sound to start a word if I'm having a particularly bad day, or in a bad mood, etc. The worse I feel about it, the harder it gets to talk; it's a vicious cycle that repeats daily. Words that begin with B or P trip me up the most. Has anyone else experienced this? Does any one have a stress-triggered stutter?