My hotmail account has been blocked and I need a security code to unblock it which needs to be sent to the alternative email I put in when I made my email, but I stupidly made my alternative email the same email. What can I do?

Contact the hotmail support team directly. They will send you a form you will have to fill out. It's a pain in the butt however if you really need to access your email thats your only option. 

Or you could a gmail account and try to import all your old emails that way. Not sure if that'll work with an email that been temporarily blocked but it's worth a shot. 

Good luck. Try contacting Hotmail support first. It worked for me a few months ago.