depressed fish?

[drigz]

Up until about a week ago, my fish seemed to be extremely heathy and happy, blowing bubble nests and jumping up whenever I entered the room.
Last Friday, I changed the water, and the next morning, it was all murky with a white tinge. So, the day after I changed the water again. But, by Monday it was murky again. Since then, he has stopped blowing bubble nests. Other that that though, he still seemed pretty happy.
When I tried to feed him a couple mornings ago, he was not interested and finally ate almost reluctantly. If he's like this should I continue to feed him, or maybe not?
He has also started to ignore anyone who enters the room, whereas he normally gets very active.
Today, it was time for another water change but when I moved him to the bathroom as I usually do, he started swimming around in circles. When I poured him into his temporary bowl, he managed to fall out of it, and into the sink which has never happened before (luckily I had put a few inches of water in it this time).
So, might there be something wrong with my fish, or am I being a little silly? For the past month, it has been quite hot at around 30 degrees Celsius, but it has been rainy lately and room temperature dropped to about 18 degrees. This means that the water in his bowl is now 23 degrees. I don't know if that matters or not..

Any comments would be appreciated. Thank you.

[abm]

Temperature fluctuations can indeed affect betta behavior quite drastically....you don't mention anything about your tank size and setup but it sounds like you don't regulate the temp with a heater, which would solve this problem. I strongly recommend it - the noticeable difference in their behavior is astounding!
I've experienced the white murkiness following a water change and although no one can confirm this is a side effect of a pH issue, that's the only water parameter that I've found to be different in the murky water vs. the clear, pre-change water. I began using Proper pH 7.0 and have not had either the pH spikes or the white murky situation recur - again, a strong recommendation for Proper pH 7.0.
As far as the sink accident goes, just be sure to observe him closely and be sure he didn't damage any fins in the fall - also be sure to add the proper amount of dechlorinator to his water.

[drigz]

Thanks for your help. I got a heater, and now the water is a little warmer. The fish does seem a little more active, but he still won't eat anything. He has been acting very different since that time with the murky water. I'm not sure if that is directly related or not, though. I'm pretty worried because he's got to eat sometime. What should I do? Is it possible that he is dying? He is probably a year and half old now, maybe more. Does someone have any more suggestions?