<s>[INST] I recently used Henna hair dye , I applied and left it over night...I woke up the next morning with a burning sens ation on, the sculp and expierenced hair lose. I feel very weak and my knees shake...I also feel very dizzy, can it be because of the Henna? An alergic reaction? Please help. [/INST] HI, thanks for using healthcare magicIt is likely a reaction to the chemicals in the dye likely due to the prolonged exposure. In most cases , it is applied and left on the scalp for 1 to 6 hours.The extended exposure would have caused these symptoms.It may be best to consult your doctor for a review. Medication may be needed if there is damage to the scalp or any other areas.I hope this helps </s>