In this case yes, if he didn't know I was diagnosed with migraines he would not have randomly suggested acid. He had an "evidence based" reason for thinking acid would help. I let people I'm close with know my symptoms. You can't always ignore people who you depend on.
Again, if you are open about the condition, and someone responds to that knowledge poorly, that is their problem. Ignore those people. But if you keep the nature of the condition under wraps, that might make it "easier" to deal with in the short term at the cost of others being able to move forward with you at all.