Does nardil make you slowly feel better and better ?

Yes: That is one common way to experience the positive effect pf an antidepressant

Nardil/ phenelzine: It does not have immediate action. One might notice some improvement in symptoms like energy level, appetite & sleep within the first couple of weeks of starting Nardil. However, it may require 6 to 8 weeks on the correct dose to get a full response- especially with depressed mood, lack of productivity or anhedonia.