The raise in interest rates is never a crisis as it indicates a strong growth in the U.S. economy. A drop in interest rates, on the other hand, is what we really need to worry about. Think about this, if the U.S. economy is beginning to slow down (the recent weaker than expected economic indicators), and if the U.S. dollar keeps falling and commodity and raw materials remain high-priced, the Federal Reserve again needs to raise the interest rates as to maintain a massive inflow of capital to the U.S. in order to boost the economy. And that is the worst case for the worldwide stock markets.
In my opinion,
a raise in interest rates -> strong economy + increase in cost of capitals -> long-term benefit + short-term fallout
a drop in interest rates -> weak economy + decrease in cost of capitals -> long-term fallout + short-term benefit