Q.japanese maple tree
I recently had our tree trimmed on april 27,2019 without checking to see if this was a good time for this After doing some research to my horror I found this was the WORST time for this procedure to be done. I was assured by the gentlemen doing the trim that it was ok to cut at this time but my research says it is when the leaves are receiving the most nutrients.Is there anything i should do to stave off any potential damage or permanent loss ?

Certified GKH Gardening Expert
Your tree should be fine. Late winter or early spring is the ideal time to prune, if needed, but light pruning at any time should be OK.
Here is more information:
https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-care-pruning.htm
https://www.gardeningknowhow.com/ornamental/trees/japanese-maple/japanese-maple-care.htm