Can trauma to neck/throat cause cricopharngeal spasm? I was in a car accident and seat belt injured neck feel like tightness no difficulty swallowing

See a doc! You may just have some swelling causing the tightness, but it's best to seen an ENT to examine the area. Treacheal fractures and other serious injuries are rare and you'd likely have significant symptoms, but you should have this evaluated. You may have a hematoma or some other issue that may need intervention.