You're not an incompetent mother; you had to get the tick off and that was that. You would have been if you'd left the tick there. Sometimes this stuff can be so hard! I remember when ds's cousin--aged 4--had a really bad splinter and really, if you had walked by the house at that time you would have thought he was being tortured. And it took over 3 hours to get the splinter out. Ds needed to take an awful-tasting medicine (he had pneumonia) when he was 4 and it was truly a nightmare getting it into him. Literally we had to pin him to the floor. And I had help! The fact that you managed it without help I think is impressive. It is rather traumatic, but it isn't lasting trauma, trust me, for a kid who is well loved and cared for. You shouldn't beat yourself up for screaming--I'm sure you were very anxious about the tick what with the Lyme disease and it is very frustrating. I personally don't think it does kids harm to see their parents experience intense emotions and react to them, even if it is at the kid, though I suppose it depends very much on the kid. Remember, you can always apologize. Kids can sense a sincere apology, I've found.