Spam with originator address of my own email address

I recently started getting spam emails which shows up as my own email address as the originator. When I look at the source header it shows my email address as sender but has some additional web addressing attached. I keep adding the additional domain information to the block sender list but new emails continue to show up from different domains. Starting to get larger and larger number of emails per day. Do not think I can block myself as a sender to my own account?  How do I suppress or eliminate this spam traffic