Assuming good saves, x3 ADHWs in a CC and 50% Magic Damage Resistance. The average damage is 67.5 dmg. Your Assassin can more than survive it.
Assuming the worst, the maximum damage with good saves, x3 ADHWs and 50% MD Resistance is 120 dmg. A level 17 Assassin with at least 16 CON will have 88HP. So yeah, it then becomes a problem. However... since you are soloing, you can always come back later with more HP and UAI (which will enable you to drink Potions of Heroism and Potion of Magic Shielding, granting you more HP and immunity to Magic Damage).
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