Depression has taken away my appetite and on top of that a change of drugs sounds like a double whammy until your body can get used to the new medication. Depression drugs have made me so incredibly nauseous that I couldn't eat anything.

Trying to drink water or juice if you can to stay hydrated is very important especially with the dizzyness.

Sorry I know you already know that. Problem is "I can't eat" suggestion is "Try to eat" yea that's not very helpful I wish I had something better to offer. Keep something small and easy like crackers handy so you can eat small bits at a time to keep your strength up until you can talk to the doctor on Monday.