i am always astonished when doc's treat me that way, but they do, and more than just one doc. it's like:
"why waste time on someone i don't know how to help ?"

what i have done in the past that works best is to write down my concerns and take that to the doc, and ask for a signed copy saying it was received (the receptionist can do it, and enter it in your medical records).

docs feel very threatened by activist patients, but lethargy should 'dampen' your affect enough that you won't be discharged (as i have been). there is always some risk: either get no help, or get punished for persisting. it's the devil's choice. i hope you find some other way.

one time i did find an advocate, a case-manager supervisor, who intervened and saved my bacon (so to speak). you might try your local MH clinic or county Health Dept. or even call the Mental Health Assoc. or NAMI for support. i live with the lethargy you talk about, and my new pdoc ran blood tests (while my GP sat on his wallet), to see if i was vitamin deficient. i wasn't, but it was a compassionate gesture, that no other doc had made in over 8 yrs. i'm now taking vitamin B12 just for the hope it might help. so far, not so much.

best wishes~!