Could sharp pain in top of head and lihgtheadedness be caused from allergies?

Possible cause: Allergies can cause persistent nasal congestion/blockage of sinuses and thus can cause sinus infection..Sphenoid sinusitis, not as common as maxilary/frontal/ethmoid sinusitis, but can result from poorly controlled allergies resulting headache/pain to top of head, and may cause some dizziness at times etc..So it is possible. I would consult to have an eval to make sure.. Good luck.

Not likely: Pain is not a typical symptom of allergic disease unless it is related to congestion - like sinus pressure or ear pressure. Headaches can occur as a result of allergy, but the pain is not typically described as "sharp". Lightheadedness is a vague symptom that could be from a number of other problems. However, if associated with itchy, runny eyes, or sneezing, it could be related.