No need to panic -- XP will work fine after April. It will be several years before virus protection and firewall programs quit supporting it--just make sure to keep them updated regularly. And if you haven't done so, make sure your XP is updated by Microsoft until April. After April, just do regular back-ups like you are supposed to do anyway and you will probably not experience any problems. Heck, I connected to the internet a few months ago with an old Win98 computer just to see if it would still work. It was slower than molasses, but it did connect. I have an XP I use with my embroidery machine and to run a few programs I like that would not run on Win7.
Many companies still use XP, so it's not going away any time soon. Actually some folks think a third part company might pick up doing updates, but I haven't heard anything firm about that.