What could be the overall damage to my vehicle from severe pothole damage.

Worst scenario = Total loss! ... In fact, that is 'most likely' on this 2001 year model Elantra!! Parts and labor may well exceed car value... and quite possibly be beyond 'reasonable' repair.. Better check KBB value and get estimate before any work is done!!

Sounds like engine oil pan may be cracked, tie rod end bent or broken and possibly damage to suspension struts and control arms.