My doctor just increased my zoloft from 100 mg to 150 feel nausea and headache is this common with the increased dose thank you?

These symptoms may indicate an intolerance to the new dosage especially if there's no other ostensible reason for the symptoms. It's best to inform your prescribing physician of these symptoms and concerns and receive advice and instructions.

This is common. It is better to increase more slowly, e.g., to increase to 125 mg for 3 days then to 150 mg.