First of all, it's not a big deal because before long you'll be able to change secondary professions.
Second, it's not a big deal because the worst case is that you need to take a monk along to heal you.
Third, if you're playing in the Prophecies campaign, you certainly can solo farm the mergoyles outside Gates of Kryta. I imagine the Yeti in Cantha are good farming fodder too. Against lower-level enemies like that, you can just damage them to death with fireballs and the like before they do much to you, and the self-healing from Aura of Restoration gets you through.
Finally, if you feel you must have some self-heal, there's plenty of that in Blood Magic, and Soul Feast can do a lot of healing without a lot of points in Death.
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