The phrase "I was feeling" is correct and usable in written English. You can use it to describe how you felt at a particular time. For example: "I was feeling exhausted, so I decided to take a nap."
I was feeling triumphant.
Already I was feeling calmer.
I was feeling pretty sad.
But I was feeling generous.
Now I was feeling it.
I was feeling very entrepreneurial.
I was feeling so good.
I was feeling jittery again.
I was feeling much better.
I was feeling disoriented".
"I was feeling bad.
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union