I have been trying to send emails from my hotmail account and when I press send the email disappears.

I have been having trouble with sending emails. apparently this has been happening for a long time and I didn't know it. Apparently since March. I type the recipient and type the body of the email and when I press send the email page goes away, leading me to believe the email had been sent. Well that has not been the case. I have checked my Sent folder to see if it's there.... Nothing. It's like I never even drafted the email. Also When I open the new email page, the attachment icon and everything on that line disappears too. what can I do to fix this problem?