Is My OCD Coming Back Or Is It Something Else?

When I was little I realized, after quite sometime, I had OCD. I would have to wash my hands over and over, repeated thoughts over and over and if I didn't I would think out the wrong or a bad thing and take it back then begin repeating the phrase in my head again, I also would have to do certain things or do things a certain way because I thought if I didn't someone would die. Over time it went away and I went back to normal, no one knew. Then as I grew up I formed anxiety, mild depression (undiagnosed proffessionally), an eating disorder (I got rid of it on my own), and now I keep on repeating religious thoughts in my head almost all the time. Like, just an example, say I would think "I love God" over and over, if I stop I would blurt out the opposite of what I really thought, shake my head and repeat it over and over aloud because I know it's not right and it's an opposing thought from out of nowhere; right after I say the phrase. And sometimes when I have a thought, the opposing one forms in my head before I finish my first thought, at the same time. like I'm thinking two things at once.. I don't know what's going on, but I know it's OCD or something worse. My (half) sister is bipolar, people from my dad's side are mentally ill as well, brother has ADD, and my mom is filled with other mental illnesses as well. It runs in our family and I can't tell if it's just OCD or if something else is wrong. I feel like I can't live my life because I have to keep reassuring myself and repeating my thoughts. My sister after looking at symptoms of bipolar/ bipolar depression, thinks that's wrong with me too. I don't know all I know is something's wrong with me but I don't want to get help. I made it go away once, I can do it again. But I'm not sure if it's just history repeating itself or something else is surfacing. Please help me.