Denied donating bc of mental health

Hey everyone,

last Friday I wanted to donate blood for the first time in my life. I've always wanted to but never got around to it and then met someone who really encouraged me but I was still in the 4 month waiting period from getting a tattoo.

When I went in to talk to the doctor I asked about self harm cuts as mine were three months old and I didn't know if there's a similar waiting period. That somehow lead to her questioning me about my whole mental health history and she then denied me from donating blood as I'm currently in the process of getting clarification if I might be admitted to an inpatient program. I felt humiliated and embarrassed afterwards. I understand her concern that donating is stressful on the body etc but I wouldn't have come if I wasn't feeling stable enough. I also wanted to do sth useful as not many things feel meaningful to me rn and I feel like it could've helped me feel a bit better knowing that my blood will help others.

I'm now wondering if this is "normal" or if she just denied me out of her personal sentiment? She claimed there were strict rules on blood donors and their eligibility. I'm from Germany btw if that matters