Your current medications (Topaz and Tryptomer) are preventatives that require time or dose adjustments to work effectively. Since your pain is currently unbearable, please consult your neurologist. They may temporarily add a muscle relaxant (like Tizanidine) or an anti-inflammatory medication (like Naproxen) to provide immediate relief. Because sitting triggers your neck pain and headaches, it could be related to nerve compression or muscle strain in the neck. Do not self-medicate with new drugs. Instead, ask your doctor about physical therapy, posture correction, and ergonomics, which are highly effective for this specific type of pain.