If your DM is allowing you to play a psionic character but refuses to put any decent psionic items in the treasures your group finds, even if only once in a while, he or she is being terribly unfair and should remember that Player Characters are heroes and exceptional individuals, who have the luck and adventuring spirit to go out and find (or happen to come upon) rare treasures in the course of their exploits.
Even if psionics is rare, it wouldn't be unreasonable for you to find some psionic item once every other level or so, from a
dorje of astral construct II to a
psionatrix of telepathy, a
crawling tattoo of hold person or
+1 power storing dagger. Of course, you could also take one or two item creation feats like Scribe Tattoo and Craft Psionic Arms & Armor or Craft Universal Item. (I'm using 3.0 references because I haven't bought into 3.5 yet and am too poor to spend money on the XPH right now) :-/
If your character is psionic, there's got to be a reason for it. Maybe there's a psionic culture on the far side of the world and you just need to get a ship (or winged boots) to go find it. Maybe you can find a Gate or portal to someplace else where fellow psions reside. Perhaps you could track down some mindflayers and barter with them for psionic items.
Or your DM could just make some magic items available that boost psionic abilities one way or another, and stop being an ass.
Edit: By the way, if your character is 'the only psionic in the world' then you have every right to demand the DM use the Psionics Are Different rules to their extreme. If you're the only psion, no one is ever going to be able to recognize your powers because you're the only person who knows psionics. It'd be hellishly stupid for someone to identify your power through Spellcraft or Knoweldge (Arcana) if you're the only psion in the world, because there's no way in hell that they could have learned what a psionic power does and what displays indicate which power. Psionic powers can't be counterspelled to begin with, so that's not even an issue.
If your power is unique, it's unlikely that creatures with Spell Resistance are going to be capable of resisting your power the way they resist magic. If only because they never would have evolved a defense against it, nor been engineered with such a defense, and besides you're harnessing a new personal energy, nothing like what those berks with the Spell Resistance have ever been exposed to. Your Negate Psionics power (if any) won't likely work against magical effects, nor will your Null Psionics Zone, but there's still a plethora of other powers that will work.
An enemy mage may detect a Symbol left on the ground and Erase it, but his arcana won't be able to detect the never-before-discovered force hiding in the same place from your psionic Crawling Tattoo of Agonizing Touch slithering through the bushes beside him. Because if psionic power was never discovered before, why should magic suddenly be able to detect its presence now?