We only hadve antipyretic, so I need to go out to prepare more medicine. We only have antipyretic, so I need to go out to prepare more medicine.

since the story is currently going on, be sure to use the present tense instead of the past tense.

We only had antipyretics so I needed to go out to prepare get more medicine. We only had antipyretics so I needed to go out to get more medicine.

“Prepare more medicine” sounds like you had to create the medicine yourself.

We only had antipyretics so I needed to go out to prepareget more medicine. We only had antipyretics so I needed to go out to get more medicine.

or We only had antipyretics so I needed to go out to buy more medicine.

I went to a pharmacy near our apartment, bought some medicine, and then went home. I went to a pharmacy near our apartment, bought some medicine, and then went home.

I went to a pharmacy near our apartment, bought some medicine, then went home. I went to a pharmacy near our apartment, bought some medicine, then went home.

I went to a pharmacy near our apartment, bought some medicine and then went home. I went to a pharmacy near our apartment, bought some medicine and then went home.

My boyfriend got COVID-919. My boyfriend got COVID-19.

My boyfriend got COVID-919. My boyfriend got COVID-19.

The Lunar New Year is coming, but my boyfriend wais positive with COVID-19. The Lunar New Year is coming, but my boyfriend is positive with COVID-19.

since your boyfriend still has COVID-19, you want to use the present tense (is) instead of the past tense (was)

The Lunar New Year is coming, but my boyfriend whas tested positive. The Lunar New Year is coming, but my boyfriend has tested positive.

“Positive” on its own, without “tested,” usually means 確定, like “I’m positive it will rain today”（我很確定今天會下雨). Therefore, “my boyfriend was positive” means “我男友確定了”.

The Lunar New Year is coming, but my boyfriend wastested positive for covid. The Lunar New Year is coming, but my boyfriend tested positive for covid.