New guy here and I have a couple of questions, if anyone can help it would be greatly appreciated. I have a new magician and trying to figure things out (sloowly

1st question: How do you heal yourself? I started with all 3 slots in magic, and have a heal spell that shows up in the action bar. Tried using this with no success at all. Scrolling through my log revealed an NPC comment about getting trained for a self heal (the 1st heal I get can only heal others I assume), and I went and purchased the self heal ability (10 points?) I now have a self heal icon that I have moved into the action bar, but I still can't heal myself (the icon remains gray no matter what level my health is at, in combat and out of combat). What am I missing here?
2nd question: Is there any way to invert the mouse look? I looked through the input menu, but was unable to find any option that would allow me to do this

Thanks in advance for any help or suggestions