weekend i am sick.
so i staied at home. = Last weekend, I was sick so I just stayed home.
but i went to First-birthday party. = However, I had to go to a First-Birthday party.
i ate many foods. = I ate a lot of food.
that food is so good. = Those were good.
so i am ate many food and i am come back home. = So, after I ate a lot of food, I came back home.

NOTE: Wow! I'm glad you enjoyed your weekend and you feel better now, dear Nain.