Hello, this is my first time taking care of turtle. i have one right now, male. he is 6 month already, and i just bought him 3 weeks ago. he is active, eats alot, and has a good sensitivity. so, here's the confusion. since the first time i bought him he had this weird kind of breathing, and also his skin was doing the shedding. he always opens his mouth and let out sounds. i dont know if its coughing or sneezing, but the sound is kinda unusual for me, its like a hiccup sound, his feet is stretched, and he has that big chin enlarged like a frog while opening his mouth for air. i really want to record the sound if i could. i tried to find some information and even went to vet before. the internet said that he got a respiratory infection, so i went to vet to make sure what's going on. and apparently, the vet said he was just stress because he's new to the environment and he is healthy since he's so active on land. but, i think the vet is wrong. i think he's getting worse. when he swam, his body was slightly tilted to the left. not so much, but i can see his body's unbalance. btw, his toe seems like swelling.. and i dont know what causes that.. because yesterday was just fine until today.
So.. anybody could help me? it means alot, i dont want to lose him

thank you.