PD? Gastro and smell issues, constipation, sleep disorder, anemia

I am concerned my husband has Parkinson’s. He has the missing smells constipation and REM sleep disorder. He has begun to have issues with gastrointestinal discomfort. Doctor can’t pinpoint. He gets very uncomfortable pain in his upper abdomen area. We have come to understand taking Pepcid helps. He is on pantoprozile (sp) but still experiences. Last year he was treated for ulcers which healed. Also he gets seriously anemic and requires iron infusions several times of year. I’ve not seen any comments about anemia related to Parkinson’s. Thank you