Learn English – “Participate in” or “participate on”

The preposition for introduces the person who feels stressful, regardless of the verb form used:

Working is stressful for some.

It is stressful for some to work.

You can omit the subject of the stress:

It is stressful to work.

NGrams shows that to is also used but for is the preferred preposition. It also shows that stress was popularised in the late 20th century.

The normal usage would probably be "for", indicating that you are nostalgic and wistful, wanting to be back there in your childhood.

"about" is also perfectly OK, but this has less sense of actually wanting to return there.

So it would make sense to write "I am nostalgic for my childhood - I wish I could be a child once more!" and "I am nostalgic about my childhood, but life has moved on, and what is past is past, with some wonderful memories".