So sorry to hear you're going through this. Pain in the left arm and the back is always concerning, in terms of whether it could be heart related...
There are several different foods that start with the letter L! Here are some: Lamb chops, Lasagna, Lettuce, Lays Potato Chips, Lamb, Legumes, Lima beans, Linguine, Laffy Taffy, Lollipops, leeks, lemon, lime, Linzer tarts, Lindt chocolate, Liquorice, lychee berries, lentils, lucky charms, luna bars, liver, lard, liverwurst and Lean Pockets.
1 L from Death Note. 2  A handful of other characters use one-letter codenames at some point, as well, (most notably L's successor Near first introduces himself as N) but, as revealed in the how to read book, L actually is his first name.