help staggering fawn

Ok so I wormed yesterday last night my fawn was ok for this am feeding she was hungry but staggered up took the whole bottle but fell down I shot her up with b complex and again in. 2 hrs. Also gave her pdrobiotocs OS there anything else I should do

invermectin orally. I think I gave too high of dose I hit all my critters yesterday and she is acting like the imvomectin crossed the blood brain barrier. Which only happens in high doses or something wrong to begin with like menigitius. but I cant find anything online on what to do for an overdose.