I've been taking this medicine for a few days but my nose and throat aren't getting better at all.
I've been on these meds for the last few days but my nose and throat are the same as they were before.
ーI've been taking this medicine for a few days but my nose and throat aren't getting better at all.
「この薬を飲んで数日経つけど、鼻と喉が全然よくならない。」
my nose and throat aren't getting better at all で「鼻と喉が全然良くならない」と言えます。
ーI've been on these meds for the last few days but my nose and throat are the same as they were before.
「ここ数日薬を飲んでるけど、鼻と喉が前と変わらない。」
my nose and the throat are the same as they were before. で「鼻と喉が前と同じ」＝「症状が変わらない」と言えます。
ご参考まで！
カナダ 
