<s>[INST] I fell and landed very hard on the ice ealier...my tailbone is extremely sore and it hurts to move.  I also hit my head and had an instant headache and goose egg on the back of my head.  Within a couple hours my neck was very stiff.  Within about 12 hours i woke up with some naseaua.  Is this a concussion and should I be going to see doctor. [/INST] Hello,U must immidiatedly go to doctor n do the recomme.ded test done. Any sort of head injury should nt   b taken lightly. Meanwhile take homeopathi  medicine natrum sulf 200 one dose.Thanks. </s>