Deductions & credits

First the notice did not say you HAD to amend in fact it said the opposite ... it said you MAY  need to amend  IF  you would be qualified for a credit not already on the original return or if your state required it.   Also you should never amend a return until the original return has been fully processed.  That said there is nothing you can do now but wait for the IRS to finally process your original return and amended return ... there is no way for anyone  to speed up the process that is in motion.