“From” spoofing is how spammers send email that looks like it comes from you that you had nothing at all to do with. I’ll look at how it’s done.
Getting spam from yourself? We all do. I’ll look at why it happens; what, if anything, you can do about it; and something unlikely but important to check.
Unfortunately most of this is out of your hands now. There are a few things you can check for, and then you’ll have to just get on with your life.
If your contacts are getting email from you that you didn’t send, then it’s very likely that your email account has been compromised.
Finding out who owns a Hotmail account is nearly impossible.