The biggest issues I had when I switched and bowled left handed for a couple of seasons was first getting used to the footwork and second taking a full arm swing, for a time when I first started as a lefty I would take a shorter back swing and then not follow through.
Once I bowled a few dozen games I got to where I could do the full swing. Also I went into this like you because of injury but I am ambidextrous playing several sports naturally left handed so I have a slight advantage over a few of the other guys I know who have done the same thing. I bowl with a guy who switched to left this year and he was a 210 to 220 avg right handed, he is doing quite well and is up to the 170's lefty.
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