Just be upfront. The way I see it is you have two choices - lie, or be blunt.
When I met my husband (online) we spoke a bit before I gave him my number. We were texting a lot. I didn't leave it long before I told him I suffered with various issues. I can't remember precisely what I said, but I just told him. I think I probably said something along the lines of I wanted to tell him so he knew what he was getting into, because I couldn't lie and say I was perfectly fine and that I was diagnosed with bipolar (at that time I was, but that was incorrect as we now know). It was fairly easy because he told me that he worked in mental health and had had his own problems with depression. I said basically if that puts him off fine, we'll leave it there. But it didn't put him off.
Mental health problems are very common and thankfully less of a taboo subject than they once were, so chances are when you do meet someone, they may well have experienced first hand their own problems. It's nothing to be ashamed of and just be totally honest. If they judge you based on that then they weren't worth knowing in the first place, and at least you know

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