If you feel it with your body, it's a sensation. Hunger-pains, headaches (pressure headaches, sinus headaches, etc) are both pain. Pain is a sensation. Fatigue is a sensation because your muscles are slowed down and/or in pain. Being tickled is a sensation. Being massaged is a sensation.

Sensations tend to cause emotions to be felt, but they're not emotions. Anything that causes pain (hunger, illness, tiredness, etc) or anything that can cause pleasure (eating, being tickled, kissing, etc) are still sensations. The way you feel DUE to them (anger, distress, sadness, joy, anxety, love) are emotions.

You can't feel a sensation withou an external influence of some sort. A headache might be caused by loud sounds, or a sinus infection. Hunger is because there isn't food in your stomach when there should be. Tiredness is because you have overworked your muscles or have deprived yourself of sleep, etc.

An emotion you can feel without the stimulus (I can feel pain just by thinking about something that is upsetting, I can feel love just by thinking about someone in particular, I can feel excitment at thinking about going to the theatre, etc).