Crystal, remove your axolotl from the tank and put him in a plastic container of dechlorinated water, lower it so he doesn't float. You may need to put him in the fridge, but only if its above 4c, so minimum of 5C.
Check your fridge temperature by placing a thermometer in a cup/glass and in the fridge at the back. Check in 20=30minutes.
If ok, then put a lid on the container, wrap with a teatowel and place in the fridge. Also, put in a bottle of dechlorinated water as you will need to do complete daily waterchanges with water of the same temperature.
What is his tank temperature at?
How long have you owned him, if only recent how long was his tank setup before you got him? Have you tested the water parameters at all - for ammonia, nitrite and nitrate?
Are there any other tank companions in the tank and/or have you added anything recently to your tank?