@Replenished ,i haven t read all the comments,so just ignore if this was already discussed
But for me some of your symptoms sounds like as classic adrenal fatigue aka HPA dysfunction,.have you done an Dutch test for this ? ACTH test ? And cortisol saliva test (wherease the saliva test hardly shows up the problem) if your interested in this more Dr .Joel Rosen on you tube is an absolute expert on HPA axis/adrenals
About the dehydration,I have this sometimes severely,no amount of water or electrolyte helps.first thing never drink water alone,always with a bit of lemon or cucumber that it better can get into the cells.or consider a saline IV.
Dehydration often is a hypothalamic problem.,which also regulates our sodium potassium levels
Pre diabetis also can be the same problem oxidative stress can cause high blood sugar,because when the body is under stress, the adrenal glands trigger the release of glucose stored in various organs, which often leads to elevated levels of glucose .....
High cholesterol is also due to oxidative stress and inflammation.its the body first repair response and antioxidant.
The problem with swallowing I have too and almost everyone in our MCS community ,it's called dysphagie and linked to many degenerative nervous system illnesses as well as to viral and bacterial infections,Mabey a vagus nerv problem ,but you said yours is mechanical ?what did they say what's the causes? One person I know has scarring which causes it .
What was the trigger which made you worse ? Stress,mold,medication,bad diet, an infection,surgery ,dental work, any change ?