Vp shunt for iih: chronic ct confirmed collapse of lateral and third ventricles, personality changes, persistent vomiting, unintentional 80lb weight loss, positional headaches, dizziness, blurred vision abdominal swelling, leg weakness. overdrainage?

The stated "changes" are significant as described. A second opinion from a neurosurgeon may be indicated, or a workup from an acknowledged center for neurology (Univ. of Michigan Medical Center, Mayo Clinic, etc.) should be considered.

Highly recommend that you have a full evaluation ASAP, as it appears that problems are escalating. Whether this involves problems with the shunt, an infection, or a comorbid medical problem is not easily apparent. A major medical center may well be useful, but do not delay and have all of this addressed right away.