...interest in nihilism...
...probably not true...don't see me buying the book...
I have never seen you at all.
Anyway, there's more than one book out there which might lead you to doubt the validity of whichever one you would select, if indeed you did make such a purchase. Fortunately, with the advent of the internet (to which you have access), a book is not required.
Better yet, visit the library and read all books on the topic.
...otc med for that icky feeling
Some would recommend a dose of the hair of the dog what bit you. Now if no dog ever done bit you, maybe some of your favorite foods and activities. They can chase the blues away and thereby make your stomach feel good.
Or better yet, discuss it with your doctor(s) as the internet is not the best place to get medical advice.