Wow thanks for posting this hopefully people see this and get help:)
Clean the blood area with paper towels to remove most of the spill. Cloth towels should not be used unless they are to be thrown out.
Yes it would be bad because I don't think that would be safe
An A1C, or Glycated hemoglobin test is taken. This test tells you average blood sugar level from the past few months.
If you really can't move your arm because of the sting, and there is pus, the best thing you can do to yourself is go to the Emergency doctor. You can take an ibuprofen if the pain is too hard.