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)...
The value of a Kennedy half dollar, especially the 1964 coins, is that they were only made for circulation in 90% Silver in 1964. Any other 90% Silver Kennedy half dollar has only been available in proof set issues. The following years after that were made in 40% Silver from 1965-1969.