Dina Lohan -- Judge Orders Psych Evaluation -- What's In Dina's Head?

Dina Lohan has something going on in her head, and the judge in her DUI case wants to know the contents ... because he just ordered a full psych evaluation.

Dina was in court this AM for her DWI case. Her lawyer, Mark Heller, claims she's alcohol free but the judge isn't necessarily buyin' what he's sellin'.

So now Dina has to get her head shrunk by a court-appointed shrink.

Lohan pled not guilty to DWI in Sept. ... after blowing a .20. Heller blamed Dina's legal predicament on the paparazzi ... claiming Dina is stressed out by the mob of photogs that follow her ... and that's what caused her to flee in a drunken state.

The judge did not impose a sentence today -- he'll wait for the psych report -- but he did say he's considering a stiff penalty -- revoking her driving privileges for 12 months ... and 100 hours of community service.