Suggest you post your system specs (what GPU, CPU, etc. to a new thread titled "what should i upgrade". Do say what you use the PC for (gaming, video edit, web surfing).
Case falling is apt to break the case, not the internal components if you assembled correctly or if this is an OEM pc (dell, HP, etc.). Given the PC kept working you are fine.
DUST is the number 1 cause of a hot CPU. Get a can of compressed air (NOT the vacuum cleaner or dust buster) and flow the dust out of the heat sink on the CPU and out the of fan on the video card. Compressed air is $7 a can at staples or amazon. Blow out the rest of your PC also. (I have an evo 212, it is great, but it is not needed unless you are overclocking your CPU, or unless you are trying to get a quieter PC. The stock cpu heat sink / fan works fine.)
The temps for GPU and CPU would not cause throttling, so would not be slowing down your PC. But it is good to get the CPU temp a bit lower.