obsessivingly
When you care so much about something that you start arguing with yourself over which suffix to use, and it turns into a full-blown tantrum.
'I just had a full-blown argument with myself over -ly vs -ing. I lost.'
'I'm obsessivingly mad because I chose the wrong suffix and now my sentence is wrong.'
'I was obsessivingly arguing with my brain, and it won. Now I have to live with -ly forever.'