Can you accidentally curse someone?

Soo this is asking for a slap on the wrist, but let me explain myself.
I've never been very strict in my practice. I like to work in what feels natural and brings me joy during rituals and meditation.
Singing is something I use in everything I do spiritually and like simple every day things (I found a bag of frozen tortellini and burst into a song about how stoaked I was the last few months have been really just ******. Part of it being the most immature and volatile break up I've ever dealt with.
For work I'm a producers vocalist ( I sing in other people's songs)
Well there was an album I was asked to write a hook for and used it as an opportunity to get some of the built up emotions out there, get some of the poison out you know?
During the writing process I wrote a really nasty ditty about the relationship and put some really negative feelings and wishes into it .
But I felt great afterwards like it had all left my system. About a week later I was in the hospital for a rare fast acting version of strept throat and stomach bleeding, and a few other unfortunate things followed. I'm not in contact with my ex so I'm not sure if those were the repercussions of a very nasty prayer or my higher self giving me the proper back hand for being so cruel to another.

The question is has using my voice as a tool in my religious a fairs bled into my physical life? Do I have to watch every word I sing, is there even a difference between the two? I'm very confused and slightly horrified about the whole experience any feed back help full repetitive or obviously is greatly appreciated!