Vitamin D3 levels of 89.4 ng/mL are elevated, but still in the high range rather than toxic (which starts above 100 ng/mL). Supplementation with a dose of 6000 IU for six months can lead to such a level, so it is worth considering consulting a doctor.

Symptoms such as abdominal pain and diarrhoea may be related to excess vitamin D, as too high levels can affect calcium metabolism and cause gastrointestinal discomfort. I encourage you to consult your doctor to evaluate supplementation. Regular checkups of calcium levels and kidney function can be helpful in preventing side effects.

I am attaching materials that may be interesting and information about the possibility of using teleconsultation:

https://www.gdziepolek.pl/telekonsultacja

https://www.gdziepolek.pl/artykuly/witamina-d-czyli-nie-unikaj-slonca