I heartily suggest that your DM drop a couple of points of LA, or allow you to swap LA with a couple of racial HD (because you're gonna suck, and badly). Reduce the ability bonuses to compensate, if you must, but LA is far too painful to get more than +1 (or +2, with buyoff).
Otherwise, since you're so very squishy, what about a ranged-focused psychic warrior? Get a Large bow of the wintermoon (auto-adjusts to your Strength score), then focus on being an assassin. Boost your damage, mobility, and defense with powers (great for protecting yourself from fire and acid damage), and see what you can do with psionic consumables (especially power stones and dorjes) to help you survive.