YOU SAID:

I feel a presence I have not felt since...

INTO JAPANESE

以来感じたことのない存在感を感じる...

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I feel a presence that I have never felt since ...

INTO JAPANESE

私はそれ以来感じたことのない存在を感じます...

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I feel a presence I've never felt since ...

INTO JAPANESE

以来、一度も感じたことのない存在感を感じています...

BACK INTO ENGLISH

Since then, I have a presence that I have never felt ...

INTO JAPANESE

それ以来、私は一度も感じたことのない存在感を感じています...

BACK INTO ENGLISH

Since then, I have a presence that I have never felt ...