4 year old concerns

My DS is 4 1/2 he goes to bed every night at 8:30/9 and is up by 7:00 each morning. Sometimes he tells me he gets up at night to play with his toys but I check on him anytime I'm up and he's always asleep (I got to bed at 12:30 and my DD is usually up once after that). But he always seems tired, in the morning, in the afternoon, at night. He's in preschool now so he doesn't nap but he used to nap 2 hours a day.
Also he clears his throat all the time, at 1st I thought it was post nasal drip from a cold but now his cold is gone so I asked him if it feels like it's coming from his nose or his belly. He said it's coming from his belly, my husband has GERD so I'm think it may be that. Do they scope kids for that?
Another thing. he still walks on his toes. We've taken him to an orthopediest and they said he's fine it's just a bad habit he'll outgrow but I'm constantly saying "flat feet" "heels down" and when he does walk it's like he shuffles his feet and doesn't lift them up and he kind of sticks his belly out really far. Anytime I ask about it they send me to the ortho and the ortho says he'll grow out of it. Maybe I'm worry for nothing but I just wanted to see what you ladies thought about this stuff.
In this picture you can see how he sticks his belly out:

They will give him a dye to drink then watch on x-ray to see if it comes back up my son had the test done when he was a week and a half old it doesn't hurt them at all the dye might taste bad but that is about it.

Quoting summerbabyX2:" My DS is 4 1/2 he goes to bed every night at 8:30/9 and is up by 7:00 each morning. Sometimes he tells ... [snip!] ... but I just wanted to see what you ladies thought about this stuff. In this picture you can see how he sticks his belly out: "

I say keep getting opinions from Drs. & go with your instincts.