If your pulse has not returned to its morning resting rate one hour later, you are still having an allergic reaction to the food you ate previously and cannot get a decent result on another food until either your pulse slows again or until the next morning.
CoinTrackers.com has estimated the 1964 Lincoln Penny value at an average of 1 cent, one in certified mint state (MS+) could be worth $12. (see details)...
With the exception of 1964-dated coins that are worth about 0.36 times the current price of silver for their metal content and 1965-69 coins that sell for about 0.15X, most other Kennedy halves are only worth face value or somewhat above, depending on their condition.