joelle,

i'm sorry your mom is sick.
i was going to say to rule out a clot but that's been done.
i'm wondering if her pcp is her only dr.
if she sees someone else for another condition, say even a rheumatologist (who are internists), perhaps they would see her for another opionion.

IMHO (& i'm not a dr) she needs to have fasting bloodwork to evaluate her BS (blood sugar) further. and, if she's put on a diabetic med she needs to be set up with a glucometer to check her blood sugars.

i'm sorry you're worried, i'd be too. i dealt with my parents's illnesses long distance too. even tho i'm a nurse they rarely took my advice.

for the short term i'd keep bugging her pcp to do further evaluations.
have her write down her Q's. have your dad be her advocate and go to the appt with her. i hope they will work together. drs aren't God and shouldn't be tx'd as such, altho lots of older folks do.

please keep us posted.