You said..."i pour water in his mouth when he opens it"...and..."i sprayed some water into it"...pouring and spraying water in his mouth might cause him to aspirate it...you might very well be drowning him by filling his lungs with water.
His behavior (hanging by his tail, shutting his eye during the day, etc.) and the sunken eyes are not good signs. Gaping could also be an indication that he is dangerously close to death...but it might also be from your watering him the way you described in what I quoted above. The head pads should be protruding....could be that they are not due to it not eating/drinking normally...at least in part.
You said..."Maybe its time to change my uvb bulb( i just changed it to the 5.0 repti sun"...what bulb did you use before this one?
You said..."i calcium dust once a week sometimes 2ce and gutloaded with apples potatoes etc."...your gutload for crickets, superworms, locusts, roaches, etc. should include a wide variety of greens (dandelions, kale, collards, endive, escarole, parsley, etc.) and veggies (carrots, squash, sweet potato, sweet red pepper, celery leaves, zucchini, etc.)
Since many of the feeders have a poor ratio of calcium to phosphorus its important to dust the insects at most feedings with a phos.-free calcium powder at most feedings.
I dust twice a month with a phos.-free calcium/D3 powder to ensure that the chameleon gets some D3 without overdoing it. I leave it to get the rest of the D3 it needs from the exposure to the UVB light. D3 from supplements can build up in the system while D3 produced from exposure to the UVB shouldn't as long as the chameleon can move in and out of it.
I dust with a vitamin powder that contains a beta carotene (prOformed) source of vitamin A. Beta carotene won't build up in the system like prEformed vitamin A will but there is controversy as to whether all/any chameleons can convert the beta carotene. Some people give a little prEformed once in a while...but don't over do it if you do. Excess prEformed vitamin A may prevent the D3 from doing its job and push the chameleon towards MBD.
Good luck!