Bugünlerde hissetmiyordum uzgüm. Inşallah biraz sonra daha iyi hisseteceğim.

I have been feeling down. Inşallah I will better soon.

thank you

I have been feeling down. : Moralim bozuktu.

( to feel down : (in turkish, exactly) morali bozuk olmak, keyifsiz olmak)

Inşallah I will better soon. : İnşallah, yakında daha iyi olurum.

A few ideas.

1. Bu günlerde - in these days

hissetmiyordum - is negative

This should be OK: Bu günlerde hissediyordum üzgün.

2. I thought the 2nd sentence was OK! But small thing hissedeceğim.

I´m sure Rumeysa´s are better, of course.

Apart from Rumeysa´s answers, shouldn´t it be "üzgün hissediyordum" ? Or is the other way around also correct?

I think both of them are correct. Morali bozuk olmak, üzgün olmak, keyifsiz olmak are so close expressions.

üzgün hissediyordum is the preferred order.

But there is something to do with emphasis and word order:

http://www.turkishclass.com/turkish_lesson_402

Rumeysa, Denzli, Ahmet and JNQ

Thank you all very much 

Rumeysa, Denzli, Ahmet and JNQ

Thank you all very much