After brain surgery, symptoms like tremors, weakness, and morning headaches can be due to several reasons, including the effects of surgery itself, residual irritation in the brain, or side effects of medicines such as Phenytoin and Clobazam, which can cause dizziness, imbalance, and tiredness; headaches in the morning may also be related to sleep quality, medication timing, or less commonly increased pressure in the brain, so they should not be ignored. Your supplements, like Coenzyme Q10, Folic Acid, and Calcium, are generally supportive but unlikely to cause these symptoms. The best next step is to consult your neurologist for a detailed review, which may include checking drug levels, adjusting doses, and possibly repeating scans or an EEG if needed. Do not stop medicines on your own, and seek urgent care if headaches worsen, or if you develop vomiting, vision changes, or new weakness.