Sharon - Sorry to hear this.
Treatment/testing:
Rehydration
Avoidance of nonsteroidal anti-inflammatory medicines - Advil, Aleve, Tylenol
No alcohol
Drink an extra cup of coffee since caffeine drives down lithium levels
Adequate (table) salt intake because lithium is a salt that competes with NaCl (table salt) for absorbtion and secretion
Dialysis for severe cases
Check blood levels of hydroxy vitamin D, B6, B12 (lithium commonly causes D deficiency) - may need an endocrinology consult to sort this out
Check thyroid function tests: T3, T4, Free T4, TSH, TPO (lithium can cause hypothyroidism)
24 hour urine testing - lithium consumers can suffer nephrogenic diabetes insipidus (different from Type 2 diabetes) -
check for this with a 24 hour urine sample - a hypotonic urine supports this diagnosis, and is typically defined as a urine with an osmolality of <300 mOsm/Kg.
Check serum calcium because lithium toxicity (which is defined as 1.5 for moderate and 2.0 for severe toxicity) - because lithium toxicity frequently causes hypercalcemia - may also need to check parathormone (parathyroid function) - will need endocrinology consult if markedly abnormal
Take liquid CoQ10 200-300mg daily to support brain mitochondrial bioenergetics
Use CPAP if there is any sleep apnea beyond 5 apneic episodes per hour in order to maintain brain and body oxygenation during sleep
Hope some of this helps - Bob