Hi Anu,
Looks like your in desperate need of reprocessing program without creating new event or reprocessing all the events.
In that case, you need to develop a custom program similar to method "process_msgs".
Class: /SAPTRX/CL_EH_EVENT_MSG_MODEL
Method: PROCESS_MSGS
You cannot directly call this method as it's protected. This method will not check if your message was processed or not and will try to process the event again. I am not sure of the impact if you reprocess the event though.
Also, unless you take care of your EE_RESET activity or it's condition, it will not matter how many times you re-process it. It will reset EE again.
Also, you need to be aware of the impact to existing statuses, changes to parameter values or any other changes to EH due to reprocessing a single event which may or may not be your latest event on EH.
Let me know how it goes.
Thanks,
Vishnu