Nitro burn

I accidentally burned my mouth with nitro, I have some tiny blisters that are white on the side of my tongue it’s been about 4 days now kinda painful but I can still eat & drink. If I go to the ER what do you guys think they’d do for me? I was thinking maybe numbing cream or just to make sure my tissue is ok and to make sure I don’t have an infection since I’m still eating