Regen will save you much more than Cura will. xD
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I'd suggest switching back to Mexitl until a weapon stronger than the Sarafan Axe becomes available, and that you wear that Ring I traded you. At least at that point you'll have approximately 100 Mag which, although not great, WILL help you [ignoring chance of success].
You'd consider it beneficial to restrict spells such as Regen to your Tonberry, as your pet won't inflict as much damage as you potentially can in the long run... unless your pet' MAG stat is relatively high and you only use it for the likes of Lantern. Still, Regen is ideal to be left as a pet-only spell for the time being.

