Why am I getting upset after meditation and sleepy during meditation?
Ven. Vijithananda said this is due to practicing Samatha meditation. When you practice Samatha you have the irritation towards any disturbances to your meditation such as sound and the people around you. You also irritated for not being able to experience that meditative happiness.
As per Ven. Vijithananda, sleepiness is some sort of progress (defeating four Maras) however you have to go beyond sleepiness.
The solution for this is to practice Satipathana.