Our chameleon's details
First of all I would like to say thanks to all your replies. I have to mention that our chameleon's ankles and wrists have been that large ever since he became an adult. Only recently have we read that the bone decease appears as swollen joints. Looking back at photographs, it does not seem that he changed at all over a year.
He has had good and bad days for the past two months now. Just yesterday, he seemed fine and had a good meal. Today, again, he did not touch lunch and seems a bit weary again.
We have decided to take him to the vet anyway on Saturday for a good check-up. You have asked for some information and here it is (you may want to sit down for this

).
Cage Type – There is no cage. We have a small fruit tree in the living room by the window where his been living all his life. The tree has been upgraded once.
Lighting – There is no UV lighting. He has a 100W basking light on a timer and artificial branches on the window sill. He basks in the sun whenever it is not too overcast.
Temperature – It’s been a while since we measured this, so I can’t remember the basking temperature. The minimum temperature may be at night when the basking light is off, but we attempt to control the flat’s temperature at about 18 degrees Celsius.
Humidity – I am positively sure that we fall short on this issue. He’s got a water feature built into the tree – though I’m pretty sure that he does not drink from this – which may provide some humidity. We mist him heavily with a spray bottle about 4 times per week.
Plants – The tree.
Location – There is minimal airflow in the living room. We have a flat on level 4 and his basking spot is about two meters from the floor.
Your Chameleon – We had this Veiled male since he was a baby for just over two years now.
Handling – We handle him about every second day. Very tame – only agitated when he wakes up in the mornings
Feeding – We try to balance his diet with lettuce, crickets, meal worms and wax worms, which he enjoys from a bowl. Lately, he does not want to touch the crickets. He used to eat daily (which is not the case anymore). We do not gut-load the feed.
Supplements - We sprinkle Sera diet supplements on the feed about once or twice a week.
Watering – We mist the chameleon very often nowadays as he always seems very thirsty. We eventually came to the conclusion that the water feature does not work.
Fecal Description – It changes every other day from white to dark brown.
History – No problems in the past.
Current Problem – He seems very fatigued (he’ll sometimes lie flat on his chin and does not move about as much as always), and has a loss of appetite (has moments of appetite recovery, but is does not seem to last).
Thanks for reading all this and your kind replies.