I'm the wife of someone with bipolar disorder looking for information on blackouts. Recently, my husband weaned himself off of medication, and for two days in a row, he didn't remember conversations that I'd had with him or that my mother had with him. When I mentioned said conversation, he said, "We never talked about that," and looked at me like I was completely making something up to screw with him. Prior to his psychotic episode (which led to diagnosis), this would happen all the time, and he basically convinced me I was crazy and I was making things up. It was a mess, it was terrifying, it destroyed my self-esteem, and I'm terrified that it's going to happen again.
Are the people in your life making this up to take advantage of you? Probably not. I wanted to add this because everyone seems to be telling you that your loved ones are messing with you, and as a partner to someone with mental illness, I wanted to offer the opinion that they love you and they're concerned for you and that the diagnosis itself is probably connecting the dots for them. Also, it likely got worse before they started noticing it, so it became hard to ignore.
Now, will folks take advantage of your diagnosis in terms of custody and childcare and whatnot? Who knows. I just wanted to let you know what it was like for someone on the other end.