There's a lot of different things that happen to the body at altitude. For example: The kidneys take over shunting some wastes out that your lungs can't breath

There's a lot of different things that happen to the body at altitude. For example: The kidneys take over shunting some wastes out that your lungs can't breathe out due to the thinning atmosphere. This means you urinate more which drags electrolytes with it and likely other things. I couldn't begin to guess what might be going on with you based on what little you have said.