Hi and thanks for the query,
It was a great idea taking anti tetanus
serum after the incident. Resurgence of the pain and swelling might be an indication of infection. It would e worthwhile getting it examined by a physician for two main reasons. First it might at some point in time require an incision if there is collection of pus and secondly, prescription of appropriate broad spectrum anti biotics. he shall deem it either necessary or not to prescribe non steroidal anti inflammatory drugs or not and a shot of anti tetanus serum. I suggest you visit your primary care
physician for a proper evaluation and management.