Why?

It getting cold nowadays. I can't believe it. it was hot as dessert before, but now it cold as ice cream. I don't understand. Why did wheather change so suddenly? My body can't keep up with wheather cange and I got cold, and the fact that I can't be half naked in the house because it too cold gets on my nerves and stresses me.
Another fact that I'm angry is that My PC is too old and it does not work very well. Why? It does not do what I want the PC to do. It just terrible. Oh~ It gives me stress.