Hi butterfly0000000, I will try to answer you with whatever knowledge I have about your procedure. Firstly, I do suggest you to do research on the internet for your type of procedure, and maybe it'll be easier to find out the symptoms people can have post procedure.
a few weeks ago, I was supposed to have the nickel patch inserted through the same procedure as yours. The hole in my heart was they said at the time 25 mmx20 mm. After putting me under, and attempting to close my heart with the device, I woke up to find out it didn't work because my hole was in fact bigger, 36 mm x 20 mm, and rather ovale then round, and therefore it failed. Before doing the procedure I had asked them all types of questions: because I had a 90% chance of being allergic to nickel as well, and they said for a few days I would possibly have swellings or redness and itching on my skin, they explained to me that internally it would not affect me because the tissue around my heart would learn to adapt to the nickel device and form itself around it, the nickel allergies were only to take affect on the skin and it could last a few days; but no extreme burning sensation like yours.
How did you feel at first when they finished the procedure?
In the end, I got an open heart surgery done to close it up, and the recovery is much longer, and the pain was much more suffering however, now i'm in recovery and I realize it was the best choice because they used my own heart tissue; therefore there is no chance of rejecting or blood clotting. I am 22 years old and it was the hardest thing ever, but I'm happy I did it.
Please speak to other cardiovascular doctors or do some vast research online for your procedure, and good luck!