YOU SAID:

I am very hungover, last night was fun but now my head is killing me and I feel sick.

INTO JAPANESE

私は二日酔いで、昨夜は楽しかったですが、今は頭が私を殺していて気分が悪くなっています。

BACK INTO ENGLISH

I had a hangover and had fun last night, but now my head is killing me and I'm feeling sick.

INTO JAPANESE

昨夜は二日酔いで楽しかったのですが、頭が痛くて気分が悪くなりました。

BACK INTO ENGLISH

I had a hangover last night and had a good time, but my head hurt and I felt sick.

INTO JAPANESE

昨夜二日酔いで楽しい時間を過ごしましたが、頭が痛くて気分が悪くなりました。

BACK INTO ENGLISH

I had a good time with a hangover last night, but my head hurt and I felt sick.

INTO JAPANESE

昨夜は二日酔いで楽しかったのですが、頭が痛くて気分が悪くなりました。

BACK INTO ENGLISH

I had a hangover last night and had a good time, but my head hurt and I felt sick.

INTO JAPANESE

昨夜二日酔いで楽しい時間を過ごしましたが、頭が痛くて気分が悪くなりました。

BACK INTO ENGLISH

I had a good time with a hangover last night, but my head hurt and I felt sick.