You just gained a level in real life! What class would you take?

[MaxiDuRaritry]

Pooh. You're no fun.

Still have to go with Warlock, then. All-day at-will powers are a heck of a thing. Besides, at low levels, a Psion - even a Telepath - can do bugger all. You have 2 PP/day (plus more based on Int, but even with an Int like mine you'd only have a total of 6), and most of what you can use is rubbish. You're not getting anything good for another two years.

But Warlock? Out of the gate, a blast and an invocation. Could be a number of things, although Beguiling Influence or All-Seeing Eyes seem particularly useful. And once Lesser Invocations come around, there are three perfect ones just waiting - Charm, Walk Unseen, and Fell Flight. At that point you pretty much rule the world.

Try defending yourself as a Psion. You have to sleep sometime. Can you go invisible? Because a Warlock can.

Sounds like you need the psionic conversion for eldritch theurge. Warlock 3/psion 3 (or ardent 2 with Practiced Manifester)/eldritch theurge 10/psion or ardent the rest of the way. Sounds like a no-lose situation, especially if rebuilding is not an option (even via negative levels and greater restoration).