I'm not sure if this is the right forum for this, but... Suppose you have insulin-dependent diabetes which requires checking one's blood sugar levels to make sure one isn't going to pass out from low blood glucose. You're in the middle of the Divine Liturgy, in the middle of a crowded pew, and you really feel the need to check. Obviously going out of the church to check is ideal, but if this poses some difficulty, is there any rule about cutting oneself in a church that would forbid checking blood-sugar quickly and inconspicuously in the pew during a service?
Thanks in advance.