Just responding to various bits that aren't SO-specific:
I can't find the comments I posted; is it possible the question was deleted?
Should I be able to find the question? I saw it about 4-6 hours ago.
It is always possible for questions to be deleted. However, here are a few tips for finding posts you've participated in assuming they weren't deleted:
- Check your browser history, especially if you know the rough time range.
- Check the Activity → All Actions tab on your profile page. Your comments, votes, etc. will be there, with links. Knowing the time range can help you narrow this down too, and remembering e.g. some words you typed in a comment can help you search the page with your browser's text search feature.
- Check your inbox on the top bar. If you received e.g. recent comment replies, they'll still be there, with a link. The Activity → Responses page on your profile can give you similar info.
- If the question is older and you remember certain things about it you can also hit up SEDE, which is updated weekly. For example, a simple comment search.
If the question was deleted, these won't yield results (well, if it's in your browser history you'll get a "question not found" page or something, which means that it was deleted).
Is it possible to get it re-opened?
If you have 3000 or more rep, you'll have the privilege to cast reopen votes. Otherwise the only thing you can do is express your desire in a comment and hope somebody notices.
I am sorry. I did not realize there are more than one meta.
Also, if you want to discuss specific details of a particular question, you should post that on the site's meta. MSE is sort of the general meta for the whole network. Every site has its own meta, which can be accessed through the community dropdown on the top bar, or generally by putting a
meta. in front of the URL (well, technically, the
meta is the second component in the URLs now, but the old ones still work and it's moot for MSO). MSO is at https://meta.stackoverflow.com.